JP6848189B2 - How to make plastic bottles, fillers, and plastic bottles - Google Patents

Description

The present invention relates to a plastic bottle, a filling material, and a method for manufacturing the filling material, and more specifically, copes with a severe situation such as so-called hot filling in which a molded plastic bottle is filled with a liquid while being sterilized at a high temperature. The present invention relates to plastic bottles, fillers, and methods for manufacturing plastic bottles.

Plastic bottles, especially PET (PolyEthylene Terephthalate) bottles, are often used as containers for filling beverages and the like. Then, from the viewpoint of resource saving and reduction of environmental load during transportation, efforts are being made to reduce the weight of PET bottles by reducing the amount of raw materials used.

However, the lighter the PET bottle, the thinner the wall thickness and the lower the strength. For example, when a PET bottle that does not have sufficient buckling strength that can withstand a load from the vertical direction is packed in a cardboard box and the cardboard boxes are stacked in a plurality of stages, the PET bottle is seated in the PET bottle. Bending deformation may occur and the load may collapse. Furthermore, when a PET bottle that does not have sufficient side wall strength that can withstand a load from the horizontal direction is loaded sideways inside the vending machine, the side surface of the PET bottle is deformed and automatically. There is a risk that the discharge from the vending machine will not be performed normally.

Further, the tendency is remarkable in a harsh situation such as so-called hot filling in which a high temperature (for example, 85 ° C.) beverage is filled, or storage of a PET bottled beverage for an extremely long period of time.

In Patent Document 1, after the container is molded, the molded container is directly transferred to the content filling step, the content is filled in the mouth non-crystalline polyester container, and the temperature of the container mouth at the time of sterilization after sealing is set. Disclosed is a method for producing a packaged content in which the container is sterilized within a range of 61 ° C. or higher and lower than the glass transition temperature (80 ° C. or lower) determined by the water content of the container.

Japanese Unexamined Patent Publication No. 2004-331205

Inside the plastic bottle, pressure changes occur as the temperature changes and the state of the contents changes. The lighter the weight of the plastic bottle, the thinner the wall thickness, and the more easily the plastic bottle is deformed due to the influence of the change in the internal pressure.

According to the method for manufacturing a container-filled content of Patent Document 1, the time from container molding to content filling is shortened by directly transferring the molded container to the content filling step, so that the container is placed in an external environment. It is said that the amount of moisture absorbed from the container is reduced, and the water content of the container can be kept low accordingly. Sufficient commercial sterility can be obtained by filling the container with the contents at a filling temperature (61 to 80 ° C.) within a temperature range below the glass transition temperature determined by the water content of the container at 61 ° C. or higher. Therefore, it is possible to use a mouth non-crystalline polyester container in which the glass transition temperature of the container is within this temperature range.

However, Patent Document 1 does not describe the strength of the container or the deformation caused by the change in the internal pressure of the container.

Therefore, an object of the present invention is to provide a plastic bottle, a filler, and a plastic bottle , which have both light weight and high strength against an external force, and absorb both positive pressure and negative pressure inside to suppress deformation. The purpose is to provide a manufacturing method.

In order to solve the above problems, the present invention relates to a plastic bottle having a mouth portion, a shoulder portion, a body portion, and a bottom portion, and the body portion has a constricted portion having a narrowed body diameter. The constricted portion is composed of an annular peripheral groove and substantially square panels connected in the circumferential direction on both sides in the axial direction with reference to the peripheral groove, and the constricted portion is said to correspond to a change in the internal pressure of the plastic bottle. It has a pressure absorbing portion that deforms inside and outside the plastic bottle, and the pressure absorbing portion further has a chamfered portion between the panels adjacent to each other in the circumferential direction, and the left and right of the chamfered portion above the peripheral groove. the spacing of the ridge line, spread upward, spacing of the ridges of the right and left of the circumferential the chamfered portion below the groove, Ri spread downward, the panels above said circumferential groove is horizontally long, the panel below the said circumferential groove is characterized by elongated der Rukoto.

Further, the peripheral groove is characterized in that the body diameter is formed at the minimum position.

Further, the body portion has a cylindrical portion having the maximum body diameter on both sides in the axial direction with the constricted portion interposed therebetween, and the cylindrical portion has an annular reinforcing groove, and a cross section of the reinforcing groove. Is arcuate.

Further, the reinforcing groove is characterized in that it includes those having a large and small depth.

Further, the ratio of the axial length of the constricted portion to the total height of the plastic bottle from the bottom portion to the mouth portion is 0.2 or more and 0.6 or less.

Further, the ratio of the axial length of the panel to the total height of the plastic bottle from the bottom to the mouth is 0.06 or more and 0.35 or less.

Further, the ratio of the width of the panel in the circumferential direction to the maximum body diameter is 0.2 or more and 0.8 or less.

Further, the plurality of the panels connected in the circumferential direction are characterized by being composed of an odd number of panels.

Furthermore, the inclination relative to the axial direction of the ridge separating the panels adjacent to each other in the circumferential direction is 0 ° or more and that this is 60 ° or less.

Further, the inclination is characterized by being different between the ridgeline of the panel on one side in the axial direction and the ridgeline of the panel on the other side.

Further, the ridges of the panel parallel to both sides in the axial direction with respect to the circumferential groove are arranged alternately in the circumferential direction, and further, the shoulder portion has iris diaphragm-shaped ribs, and the ribs of the ribs. direction of inclination, and wherein identical der Rukoto the direction of the inclination of the ridge.

Further, the plastic bottle is heat-resistant to a high-temperature liquid to be filled, and the mouth portion is transparent.

Further, the temperature of the high temperature liquid is 71 ° C. or higher and 95 ° C. or lower.

Further, the temperature of the high temperature liquid is 81 ° C. or higher and 90 ° C. or lower.

Further, the crystallinity of the body portion is 25% or more and 45% or less.

Further, the material constituting the plastic bottle is polyethylene terephthalate.

Further, the density of the body portion is 1.567 g / cm ³ or more and 1.387 g / cm ³ or less.

Further, the body is cut into 10 mm × 50 mm cut pieces, and the tensile fracture strain at 300 mm / min at 85 ° C. of the cut pieces is 40% or more and 68% or less. To do.

Further, the filler according to the present invention is characterized by being composed of the above-mentioned plastic bottle and a high-temperature liquid to be filled.

Further, the decompression amount of the filler is 1 kPa or more and 20 kPa or less.

Further, the present invention is a method for manufacturing a plastic bottle formed from a preform having a transparent mouth portion, and the plastic bottle has a mouth portion, a shoulder portion, a body portion, and a bottom portion. The body portion has a constricted portion having a narrowed body diameter and a cylindrical portion having the maximum body diameter on both sides in the axial direction with the constricted portion interposed therebetween, and the cylindrical portion is annular. has a reinforcing groove,該補Tsuyomizo include those depth and small, the constricted portion, an annular peripheral groove, on both sides of the axial direction relative to the circumferential groove, the panel having a substantially square circumference It is configured in a row in the direction and has a pressure absorbing portion that deforms inside and outside the plastic bottle in response to a change in the internal pressure of the plastic bottle, and the pressure absorbing portion is between the panels adjacent to each other in the circumferential direction. The distance between the left and right ridges of the chamfer above the peripheral groove is widened upward, and the distance between the left and right ridges of the chamfer below the peripheral groove is downward. spreads toward the panel above said circumferential groove is oblong, the panel below the said circumferential groove is vertically long, the step of heating the barrel of the preform, the mold from said preform The plastic bottle is blow-molded using the plastic bottle, and the blow-molding step further includes a step of blowing cooling air onto the plastic bottle to blow the body of the preform at 115 ° C. or higher and 135 ° C. or higher. It is characterized in that the temperature of the body mold of the mold is set to 80 ° C. or higher and 125 ° C. or lower by heating below.

Further, the step of blowing cooling air onto the plastic bottle is omitted, and the temperature of the body mold is set to 80 ° C. or higher and 115 ° C. or lower.

Further, the temperature of the body portion of the preform is higher than the temperature of the body mold.

According to the present invention, in a plastic bottle having a mouth part, a shoulder part, a body part, and a bottom part, the body part has a constricted part having a narrowed body diameter, and the constricted part has a constricted part. An annular peripheral groove and a substantially square panel are connected in the circumferential direction on both sides in the axial direction with respect to the peripheral groove, and a pressure absorbing part that deforms inside and outside the plastic bottle in response to a change in the internal pressure of the plastic bottle. The pressure absorbing portion further has a chamfered portion between panels adjacent to each other in the circumferential direction, and the distance between the left and right ridges of the chamfered portion above the peripheral groove widens upward and is wider than the peripheral groove. the distance between the left and right edge line of the chamfered portion of the lower, Ri spread downward, upper panel oblong than the peripheral groove, the lower panel from circumferential grooves Vertical der Runode, and light weight, high against external force It is possible to provide a plastic bottle that has both strength and absorbs both positive pressure and negative pressure inside to suppress deformation.

Further, the circumferential groove has both light weight and higher strength against external force according to the structure formed at the position where the body diameter is the minimum, and absorbs both the positive pressure and the negative pressure inside. It is possible to provide a plastic bottle in which deformation is suppressed.

Further, the body portion has a cylindrical portion having the maximum body diameter on both sides in the axial direction with the constricted portion sandwiched therein, and the cylindrical portion has an annular reinforcing groove, and the cross section of the reinforcing groove is arcuate. According to the above, it is possible to provide a plastic bottle that has both light weight and higher strength against an external force, and absorbs both positive pressure and negative pressure inside to further suppress deformation.

Further, the reinforcing groove has both light weight and higher strength against an external force according to a configuration including a large and small depth, and is deformed by absorbing both positive pressure and negative pressure inside. It is possible to provide a plastic bottle in which the amount of stress is suppressed.

Furthermore, according to the configuration in which the ratio of the axial length of the constricted portion to the total height of the plastic bottle from the bottom to the mouth is 0.2 or more and 0.6 or less, lightness and high strength against external force are achieved. It is possible to provide a plastic bottle that has both of them and absorbs both positive pressure and negative pressure inside to further suppress deformation.

Furthermore, according to the configuration in which the ratio of the axial length of the panel to the total height of the plastic bottle from the bottom to the mouth is 0.06 or more and 0.35 or less, both lightness and high strength against external force are combined. It is possible to provide a plastic bottle that has and absorbs both positive pressure and negative pressure inside to further suppress deformation.

Further, according to the configuration in which the ratio of the width of the panel in the circumferential direction to the maximum body diameter is 0.2 or more and 0.8 or less, it has both light weight and high strength against external force, and has a positive inside. It is possible to provide a plastic bottle that absorbs both pressure and negative pressure to further suppress deformation.

Furthermore, since the plurality of panels connected in the circumferential direction are composed of an odd number, they have both light weight and high strength against external force, and absorb both positive pressure and negative pressure inside to be more deformed. It is possible to provide a plastic bottle that can be suppressed.

Further, according to the configuration in which the inclination of the ridge line separating the adjacent panels in the circumferential direction with respect to the axial direction is 0 ° or more and 60 ° or less, both light weight and high strength against external force are exhibited, and the positive pressure inside is positive. , And can provide a plastic bottle that absorbs both negative pressure and further suppresses deformation.

Further, according to the configuration in which the ridgeline of the panel on one side in the axial direction and the ridgeline of the panel on the other side are different, the inclination has both lightness and high strength against external force, and the positive pressure inside. And it is possible to provide a plastic bottle that absorbs both negative pressure and further suppresses deformation.

Further, the ridges of the panels parallel to both sides in the axial direction with respect to the circumferential groove are arranged alternately in the circumferential direction, and the shoulder portion has iris-squeezed ribs, and the direction of inclination of the ribs is the ridgeline. According to the configuration Ru same der the direction of inclination, and lightweight, and has both a high strength against an external force, and a positive pressure inside, and a plastic bottle deformation can be further suppressed both absorbed to the negative pressure Can be provided.

Further, the plastic bottle has heat resistance to the high temperature liquid to be filled, and the mouth part has both light weight and high strength against external force according to the transparent structure, and has a positive inside. Both pressure and negative pressure are absorbed to suppress deformation, and a plastic bottle having a wider range of application can be provided.

Further, since the temperature of the high-temperature liquid is 71 ° C. or higher and 95 ° C. or lower, it has both light weight and high strength against external force, and absorbs both positive pressure and negative pressure inside to cause deformation. It is possible to provide plastic bottles that are suppressed, have a wider range of application, and contribute to higher quality products.

Further, since the temperature of the high-temperature liquid is 81 ° C. or higher and 90 ° C. or lower, it has both light weight and high strength against external force, and absorbs both positive pressure and negative pressure inside to cause deformation. It is possible to provide plastic bottles that are suppressed, have a wider range of application, and contribute to higher quality products.

Further, according to the configuration in which the crystallinity of the body is 25% or more and 45% or less, it has both light weight and high strength against external force, and absorbs both positive pressure and negative pressure inside. As a result, deformation is suppressed, and a plastic bottle with a wider range of application can be provided.

Furthermore, according to the structure in which the material constituting the plastic bottle is polyethylene terephthalate, it has both light weight and high strength against external force, and absorbs both positive pressure and negative pressure inside to suppress deformation. And can provide a wider range of plastic bottles.

Further, according to the configuration in which the density of the body is 1.567 g / cm ³ or more and 1.387 g / cm ³ or less, both light weight and high strength against external force are exhibited, and the positive pressure inside is positive. , And negative pressure can be absorbed to suppress deformation, and a plastic bottle having a wider range of application can be provided.

Further, according to the configuration in which the body is cut into a 10 mm × 50 mm cut piece and the tensile fracture strain at 300 mm / min at 85 ° C. of the cut piece is 40% or more and 68% or less, it is lightweight. It is possible to provide a plastic bottle having a wide range of application by having both properties and high strength against an external force and absorbing both positive pressure and negative pressure inside to suppress deformation.

Further, since the filler according to the present invention is composed of the above-mentioned plastic bottle and the high-temperature liquid to be filled, it has both light weight and high strength against an external force, and has a positive pressure inside and a positive pressure inside. It is possible to provide a filler that absorbs any of the negative pressures and suppresses deformation.

Further, according to the configuration in which the decompression amount of the filler is 1 kPa or more and 20 kPa or less, it has both light weight and high strength against external force, and absorbs both positive pressure and negative pressure inside. It is possible to provide a filler in which deformation is suppressed.

Further, the present invention is a method for manufacturing a plastic bottle molded from a preform having a transparent mouth portion, and the plastic bottle has a mouth portion, a shoulder portion, a body portion, and a bottom portion, and the plastic bottle has a body portion. The portion has a constricted portion having a narrowed body diameter and a cylindrical portion having the maximum body diameter on both sides in the axial direction across the constricted portion , and the cylindrical portion has an annular reinforcing groove. , Reinforcing grooves include those with large and small depths, and the constricted part is composed of an annular peripheral groove and substantially square panels connected in the circumferential direction on both sides in the axial direction with reference to the peripheral groove, and is a plastic bottle. It has a pressure absorbing part that deforms inside and outside of the plastic bottle in response to a change in the internal pressure of the plastic bottle, and the pressure absorbing part further has a chamfering part between adjacent panels in the circumferential direction and is chamfered above the peripheral groove. The distance between the left and right ridges of the part is widened upward, the distance between the left and right ridges of the chamfered part below the peripheral groove is widened downward, and the panel above the peripheral groove is horizontally long and below the peripheral groove. The panel is vertically long and includes a process of heating the body of the preform and a process of blow molding a plastic bottle from the preform using a mold. In the process of blow molding, cooling air is applied to the plastic bottle. The body of the preform is heated to 115 ° C or higher and 135 ° C or lower, and the temperature of the body mold of the mold is set to 80 ° C or higher and 125 ° C or lower. It is possible to provide a method for producing a plastic bottle that has both high strength and absorbs both positive pressure and negative pressure inside to suppress deformation.

Furthermore, the process of blowing cooling air onto the plastic bottle is omitted, and the temperature of the body mold is set to 80 ° C or higher and 115 ° C or lower, so that it has both light weight and high strength against external force, and has a positive pressure inside. , And a method for producing a plastic bottle in which deformation is suppressed by absorbing both negative pressure can be provided.

Furthermore, since the temperature of the body of the preform is higher than the temperature of the body mold, it has both light weight and high strength against external force, and it absorbs both positive and negative pressure inside and deforms. It is possible to provide a method for manufacturing a plastic bottle in which the temperature is suppressed.

It is a front view which showed the PET bottle as an example of the plastic bottle which concerns on this embodiment. It is a side view of a PET bottle. It is a top view of a PET bottle. It is a bottom view of a PET bottle. It is a front view which showed the PET bottle which concerns on the modification. It is a side view of the PET bottle which concerns on the modification. It is the schematic which showed typically the manufacturing apparatus of the filler which concerns on this embodiment. It is sectional drawing which showed an example of the heating device of a preform. It is sectional drawing which shows typically the preform and the PET bottle after blow molding. It is a flow chart which showed the outline of the manufacturing process of the filler which concerns on this embodiment. It is the schematic which showed an example of blowing cooling air to a PET bottle. It is a flow chart which showed the outline of the manufacturing process of the filler which concerns on another embodiment. It is a front view of the PET bottle of Comparative Example 1. It is a front view of the PET bottle of Comparative Example 2 and Comparative Example 3.

The details of the embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the plastic bottle according to the present embodiment will be described in detail. FIG. 1 is a front view showing a PET bottle 1 as an example of a plastic bottle according to the present embodiment, and FIG. 2 is a side view of the PET bottle 1. The PET bottle 1 has a mouth portion 10, a shoulder portion 20, a body portion 30, and a bottom portion 40. In the following, for convenience of explanation, the mouth portion 10 in which the contents are filled into the container in the state of FIGS. 1 and 2 upright so that the axial direction of the PET bottle 1 extends vertically is set as the upper side. ..

It is preferable that the mouth portion 10 is not crystallized until it is colored white by heating in a so-called crystallization device, but is transparent from the viewpoint of rationalization and speeding up of the manufacturing process of the PET bottle 1.

The upper side of the shoulder portion 20 is connected to the mouth portion 10, while the lower side thereof is connected to the body portion 30. The shoulder portion 20 has a substantially truncated cone-shaped shape whose diameter increases from the upper side to the lower side. It is preferable that the shoulder portion 20 is curved to the outside of the PET bottle 1 from the viewpoint of increasing the side wall strength of the PET bottle 1 and increasing the capacity. However, when the mouth portion 10 is gripped and the PET bottle 1 is conveyed, the shoulder portion 20 may interfere with each other, and the shapeability when the PET bottle 1 is formed by blow molding is not good. Therefore, it is not preferable that the shoulder portion 20 is extremely curved outward, particularly upward.

FIG. 3 is a plan view of the PET bottle 1. Here, referring to FIG. 3, an iris diaphragm-shaped rib 22 is formed on the shoulder portion 20 so as to project to the outside of the PET bottle 1 in a plan view. The rib 22 has the function of a support column with respect to the axial load of the PET bottle 1. By forming the rib 22 in the shape of an iris diaphragm, the axial load of the PET bottle 1 can be dispersed in the circumferential direction. Therefore, the iris diaphragm-shaped rib 22 can increase the buckling strength of the PET bottle 1.

A substantially quadrangular diaphragm blade-shaped panel 23 is formed between the adjacent ribs 22, 22. The diaphragm blade-shaped panel 23 is configured to be deformable inside and outside the PET bottle 1, particularly inside. Therefore, the diaphragm blade-shaped panel 23 has a function of absorbing pressure by deforming in accordance with a change in the internal pressure of the PET bottle 1, particularly a decompression. On the other hand, even when the internal pressure of the PET bottle 1 changes, the structure itself of the shoulder portion 20 is maintained with the rib 22 as the skeleton. As illustrated in FIG. 1 and the like, the side of the diaphragm blade-shaped panel 23 on the body side 30 is formed in an arc shape curved downward. With this structure, the diaphragm blade-shaped panel 23 can absorb the axial load of the PET bottle 1 by the lower side of the arc shape. Therefore, the diaphragm blade-shaped panel 23 can increase the buckling strength of the shoulder portion 20.

The shoulder portion 20 configured in this way has both light weight and high strength against external force, and can absorb both positive pressure and negative pressure inside to suppress irregular deformation. Then, for example, when the PET bottle 1 is particularly under negative pressure, the shoulder portion 20 is prevented from being dented even if a large force is applied to the shoulder portion 20 due to the PET bottle 1 falling down or the PET bottle 1 being hit by something from the outside. can do.

The body portion 30 has a constricted portion 50 having a narrowed body diameter as a part thereof. The constricted portion 50 can improve the ease of holding the PET bottle 1. Further, it is preferable that the body portion 30 has cylindrical portions having the maximum body diameter on both sides in the axial direction with the constricted portion 50 interposed therebetween. As a result, even if the PET bottle 1 is turned sideways, each of the cylindrical parts having the largest body diameter becomes a grounding portion and can be placed stably. For example, it can be applied to a vending machine that is loaded sideways. .. The body portion 30 illustrated in FIG. 1 and the like has an upper cylindrical portion 60 connected to the shoulder portion 20, a constricted portion 50 connected to the upper cylindrical portion 60 via the upper connecting portion 80, and a lower connecting portion to the constricted portion 50. It includes a lower cylindrical portion 70 connected via the portion 85. The upper cylindrical portion 60 and the lower cylindrical portion 70 are formed on the body portion 30 as cylindrical portions having a maximum cylinder diameter D1.

The constricted portion 50 has an annular peripheral groove 51 and pressure absorbing portions 52 on both sides in the axial direction with reference to the peripheral groove 51. The constricted portion 50 is formed to have a length H2 in the axial direction. If the axial length H2 of the constricted portion 50 is too short, the region of the pressure absorbing portion 52 cannot be sufficiently secured, and if the axial length H2 is too long, the strength of the PET bottle 1 is secured. It becomes difficult to do. The constriction 50 has a ratio (H2 / H1) of the axial length H2 of the constriction 50 to the total height H1 of the PET bottle 1 from the bottom 40 to the mouth 10 of 0.2 or more and 0.6 or less. Is preferable.

The peripheral groove 51 is recessed inward in the radial direction of the PET bottle 1, has a circular cross-sectional shape in the horizontal direction, and has a substantially U-shape having a flat bottom surface in the vertical cross-sectional shape. The peripheral groove 51 can increase the buckling strength of the constricted portion 50. The peripheral groove 51 may have a substantially arcuate cross-sectional shape in the vertical direction, and even if the PET bottle 1 is hung in a state where the contents at a high temperature are filled, the peripheral groove 51 is prevented from being deformed so as to extend in the axial direction. ..

When the peripheral groove 51 is formed at the position where the body diameter is the minimum, the peripheral groove 51 may have a well-proportioned shape that exhibits excellent strength against a load from both the top and bottom and the horizontal. The peripheral groove 51 illustrated in FIG. 1 and the like is formed so as to have a minimum body diameter D2 by further denting inward in the radial direction from the position where the body diameter is the minimum. As described above, when the peripheral groove 51 has the minimum body diameter D2, the stress with respect to the axial load of the PET bottle 1 is concentrated on the peripheral groove 51. At that time, the peripheral groove 51 is deformed to disperse the stress, so that a specific portion of the PET bottle 1 becomes a bending point and buckling deformation is prevented. Therefore, the peripheral groove 51 having the minimum body diameter D2 can increase the buckling strength of the PET bottle 1.

The ratio (D2 / D1) of the minimum cylinder diameter D2 of the peripheral groove 51 to the maximum cylinder diameter D1 of the upper cylindrical portion 60 and the lower cylindrical portion 70 is preferably 0.55 or more and 0.95 or less, and is 0. More preferably, it is 6.6 or more and 0.7 or less. With such a configuration, the stress with respect to the axial load of the PET bottle 1 is concentrated on the peripheral groove 51 which is the minimum diameter of the body portion 30, and the buckling strength of the PET bottle 1 can be effectively increased. it can. If (D2 / D1) is larger than 0.95, the stress with respect to the axial load of the PET bottle 1 is not concentrated on the peripheral groove 51, and a load is applied to another location, for example, the pressure absorbing portion 52. .. On the other hand, if (D2 / D1) is less than 0.55, the stress with respect to the axial load of the PET bottle 1 is excessively concentrated in the peripheral groove 51, and sufficient buckling strength cannot be obtained.

If the depth of the peripheral groove 51 is too shallow, the stress is less likely to be dispersed with respect to the axial load of the PET bottle 1, and the PET bottle 1 is likely to be buckled and deformed. On the other hand, if the peripheral groove 51 is too deep, the shapeability of the PET bottle 1 at the time of molding is lowered. The ratio of the depth of the peripheral groove 51 to the minimum body diameter D2 is preferably 0.005 or more and 0.07 or less, and more preferably 0.03.

Further, if the width of the peripheral groove 51 is too wide, the stress is less likely to be dispersed with respect to the axial load of the PET bottle 1, and the PET bottle 1 is easily buckled and deformed. On the other hand, if the width of the peripheral groove 51 is too narrow, the shapeability of the PET bottle 1 at the time of molding is lowered. The ratio of the width of the peripheral groove 51 to the depth of the peripheral groove 51 is preferably 0.5 or more and 5.0 or less.

The pressure absorbing portion 52 has one side in the axial direction, that is, the upper upper pressure absorbing portion 53, and the other side in the axial direction, that is, the lower lower pressure absorbing portion 54, with reference to the peripheral groove 51. The upper pressure absorbing portion 53 illustrated in FIG. 1 and the like has a body diameter gradually increasing from the peripheral groove 51 toward the upper side, and the lower pressure absorbing portion 54 has a body diameter gradually increasing from the peripheral groove 51 toward the lower side. .. Both the upper pressure absorbing unit 53 and the lower pressure absorbing unit 54 have a function of absorbing both the positive pressure and the negative pressure inside the PET bottle 1 to suppress the distorted deformation of the PET bottle 1. In a configuration in which the area of the lower pressure absorbing portion 54 is simply expanded, the strength, particularly the buckling strength, is lowered. On the other hand, the PET bottle 1 has not only the lower pressure absorbing portion 54 but also the upper pressure absorbing portion 53, so that the area of the pressure absorbing portion 52 is expanded, and the buckling strength that tends to be insufficient in the round bottle is sufficiently sufficient. It is configured to absorb changes in internal pressure more while ensuring it.

The upper pressure absorbing portion 53 is formed in a tubular shape by connecting a plurality of flat plate (panel) -shaped quadrangular panels 55a in the circumferential direction. Each of the quadrangular panels 55a is configured to be deformed inside and outside the PET bottle 1 in response to a change in the internal pressure of the PET bottle 1. The upper pressure absorbing portion 53 illustrated in FIG. 1 and the like has five quadrangular panels 55a. Therefore, the horizontal cross-sectional shape of the upper pressure absorbing portion 53 is substantially pentagonal. A chamfered substantially parallelogram chamfered portion 56a is formed between the adjacent quadrangular panels 55a and 55a. The quadrangular panel 55a is formed into a substantially parallelogram divided by an upper side 57a, a lower side 58a, and left and right ridges 59a and 59a in a front view.

As illustrated in FIG. 1, the upper side 57a is preferably curved in an arc shape toward the upper side and is in contact with the upper connecting portion 80. In particular, it is preferable that the upper side 57a is in contact with the groove bottom portion of the upper connecting portion 80. When the upper side 57a and the upper connecting portion 80 are in contact with each other, the load applied to the upper connecting portion 80 is dispersed on the upper side 57a, and excessive stress concentration on the upper connecting portion 80 is prevented. Further, the upper side 57a curved in an arc shape toward the upper side can absorb the axial load of the PET bottle 1 and increase the buckling strength.

The lower side 58a is also substantially vertically symmetrical with the upper side 57a. That is, as illustrated in FIG. 1, the lower side 58a is preferably curved downward in an arc shape and is in contact with the peripheral groove 51. In particular, it is preferable that the lower side 58a is in contact with the bottom of the peripheral groove 51. When the lower side 58a and the peripheral groove 51 are in contact with each other, the load applied to the peripheral groove 51 is dispersed to the lower side 58a, and excessive stress concentration on the peripheral groove 51 is prevented. Further, the lower side 58a curved in an arc shape toward the lower side can absorb the axial load of the PET bottle 1 and increase the buckling strength.

The ridge line 59a is a boundary line between the quadrangular panels 55a adjacent to each other in the circumferential direction of the PET bottle 1 and the chamfered portion 56a. The ridge line 59a extends between the portion having the maximum cylinder diameter D1 and the portion having the minimum cylinder diameter D2. The ridge line 59a has a function as a support column for the axial load of the PET bottle 1. The ridge line 59a preferably has an inclination of an angle θa with respect to the vertical straight line L. Since the ridge line 59a has an inclination, the axial load of the PET bottle 1 is distributed in the circumferential direction, and the buckling strength can be increased. If the angle θa is too large, the function of the ridge line 59a as a support is diminished. Therefore, the angle θa is preferably 0 ° or more and 60 ° or less, and more preferably 30 ° or more and 40 ° or less.

Although not shown, the upper pressure absorbing portion 53 may be configured so as not to have the chamfered portion 56a and to directly connect the adjacent quadrangular panels 55a and 55a in the circumferential direction. In this case, the boundary line separating the adjacent quadrangular panels 55a and 55a may have the same configuration as the ridge line 59a.

However, the upper pressure absorbing portion 53 preferably has a chamfered portion 56a. The chamfered portion 56a having a width in the circumferential direction disperses the load applied to the ridge line 59a from the vertical direction of the PET bottle 1, prevents excessive concentration of stress on the ridge line 59a, and can increase the buckling strength.

The chamfered portion 56a may have a so-called R chamfered shape, which is not a flat surface but is rounded so as to be curved outward in the radial direction of the PET bottle 1. The surface curved toward the outside can increase the amount of deformation of the PET bottle 1 inward in the radial direction. Therefore, the chamfered portion 56a that curves toward the outside absorbs the change in the internal pressure by deforming inward and changing the internal volume when the inside of the PET bottle 1 is particularly depressurized, so that the PET bottle 1 absorbs the change in the internal pressure. It plays a part in the function of preventing deformation into distortion.

The lower pressure absorbing portion 54 has a configuration similar to that of the upper pressure absorbing portion 53 described above. That is, the lower pressure absorbing portion 54 is formed in a tubular shape by connecting a plurality of flat plate-shaped quadrangular panels 55b in the circumferential direction. Each of the quadrangular panels 55b is also configured to be deformed inside and outside the PET bottle 1 in response to a change in the internal pressure of the PET bottle 1.

The lower pressure absorbing portion 54 illustrated in FIG. 1 and the like has five quadrangular panels 55b. Therefore, the horizontal cross-sectional shape of the lower pressure absorbing portion 54 also has a substantially pentagonal shape. A chamfered substantially parallelogram chamfered portion 56b is formed between the adjacent quadrangular panels 55b and 55b. The quadrangular panel 55b is formed into a substantially parallelogram divided by an upper side 57b, a lower side 58b, and left and right ridges 59b and 59b in a front view. However, while the upper pressure absorbing portion 53 is a horizontally long quadrangular panel 55a, the lower pressure absorbing portion 54 is composed of a vertically long quadrangular panel 55b.

As illustrated in FIG. 1, the upper side 57b is preferably curved in an arc shape toward the upper side and is in contact with the peripheral groove 51. In particular, it is preferable that the upper side 57b is in contact with the bottom of the peripheral groove 51. When the upper side 57b and the peripheral groove 51 are in contact with each other, the load applied to the peripheral groove 51 is dispersed to the upper side 57b, and excessive stress concentration on the peripheral groove 51 is prevented. Further, the upper side 57b curved in an arc shape toward the upper side can absorb the axial load of the PET bottle 1 and increase the buckling strength.

The lower side 58b is also substantially vertically symmetrical with the upper side 57b. That is, as illustrated in FIG. 1, the lower side 58b is preferably curved in an arc shape toward the lower side and is in contact with the lower connecting portion 85. In particular, it is preferable that the lower side 58b is in contact with the groove bottom portion of the lower connecting portion 85. When the lower side 58b and the lower connecting portion 85 are in contact with each other, the load applied to the lower connecting portion 85 is dispersed to the lower side 58b, and excessive stress concentration on the lower connecting portion 85 is prevented. Further, the lower side 58b curved in an arc shape toward the lower side can absorb the axial load of the PET bottle 1 and increase the buckling strength.

The ridge line 59b is a boundary line between the quadrangular panels 55b adjacent to each other in the circumferential direction of the PET bottle 1 and the chamfered portion 56b. The ridge line 59b extends between the location of the minimum cylinder diameter D2 and the location of the maximum cylinder diameter D1. The ridge line 59b has a function as a support column for the axial load of the PET bottle 1. The ridge line 59b preferably has an inclination of an angle θb with respect to the vertical straight line L. Since the ridge line 59b has an inclination, the axial load of the PET bottle 1 is distributed in the circumferential direction, and the buckling strength can be increased. If the angle θb is too large, the function of the ridge line 59b as a support is diminished. Therefore, the angle θb is preferably 0 ° or more and 60 ° or less, and more preferably 30 ° or more and 40 ° or less.

The inclination angle θa of the ridge line 59a and the inclination angle θb of the ridge line 59b may be the same, but if they are different, the PET bottle 1 is less likely to be deformed, which is more preferable.

In the PET bottle 1 illustrated in FIG. 1 and the like, one of the ridge lines 59a and one of the ridge lines 59b are paired. That is, the paired ridge line 59a and the ridge line 59b are arranged as one continuous line, and the lower end of the ridge line 59a and the upper end of the ridge line 59b are substantially the same position in the circumferential direction. By forming a pair of the ridge line 59a and the ridge line 59b in this way, the stress generated in the peripheral groove 51 can be dispersed on both sides in the axial direction in a well-balanced manner. Further, the PET bottle 1 having a high design property can be provided by the structure in which the ridge line 59a and the ridge line 59b are paired.

Although not shown, the lower pressure absorbing portion 54 may be configured so as not to have the chamfered portion 56b and to directly connect the adjacent quadrangular panels 55b and 55b in the circumferential direction. In this case, the boundary lines of the adjacent quadrangular panels 55b and 55b may have the same configuration as the ridge line 59b.

However, the lower pressure absorbing portion 54 preferably has a chamfered portion 56b. The chamfered portion 56b having a width in the circumferential direction disperses the load applied to the ridge line 59b from the vertical direction of the PET bottle 1, prevents excessive concentration of stress on the ridge line 59b, and can increase the buckling strength.

The chamfered portion 56b may also have a so-called R chamfered shape, which is not a flat surface but is rounded so as to be curved outward in the radial direction of the PET bottle 1. The surface curved toward the outside can increase the amount of deformation of the PET bottle 1 inward in the radial direction. Therefore, the chamfered portion 56b that curves toward the outside absorbs the pressure change by deforming inward to change the internal volume when the inside of the PET bottle 1 is particularly depressurized, and the PET bottle 1 is distorted. It plays a part in the function of preventing the deformation into.

As described above, the quadrangular panel 55a and the quadrangular panel 55b are configured to be deformable inside and outside the PET bottle 1. Therefore, the quadrangular panel 55a and the quadrangular panel 55b have a function of absorbing pressure by deforming according to a change in the internal pressure of the PET bottle 1. On the other hand, even when the internal pressure of the PET bottle 1 changes, the structure itself of the upper pressure absorbing portion 53 is maintained with the upper side 57a, the lower side 58a, and the left and right ridge lines 59a, 59a as the skeleton, and the upper side 57b, the lower side 58b, and the lower side 58b, and The structure itself of the lower pressure absorbing portion 54 is maintained with the left and right ridges 59b and 59b as the skeleton.

Inside the PET bottle 1, there is a sudden temperature change when filling the contents, a temperature difference between when the contents are filled and when the PET bottle 1 is stored, and a pressure change due to changes in the state of the contents such as water evaporation and oxidation. Occurs. Since the lightened PET bottle 1 has a thin wall thickness, it is easily deformed under the influence of a change in internal pressure. The quadrangular panel 55a and the quadrangular panel 55b, which are deformably configured inside and outside the PET bottle 1, are pushed toward the outside of the PET bottle 1 when the internal pressure increases, and inside the PET bottle 1 when the internal pressure decreases. Pushed towards. Therefore, when the internal pressure of the PET bottle 1 changes, the quadrangular panel 55a and the quadrangular panel 55b are deformed inward and outward to change the internal volume to absorb the change in the internal pressure, and the PET bottle 1 is deformed into a distorted shape. It has a function to prevent this from happening.

If the area of each of the quadrangular panel 55a and the quadrangular panel 55b is too small, it becomes difficult to deform and it becomes difficult to absorb the change in the internal pressure of the PET bottle 1. On the other hand, if the areas of the quadrangular panel 55a and the quadrangular panel 55b are too large, the buckling strength and the side wall strength of the upper pressure absorbing portion 53 and the lower pressure absorbing portion 54 are lowered, and the rigidity of the PET bottle 1 is reduced. Is not enough. Further, if the areas of the quadrangular panel 55a and the quadrangular panel 55b are too large, kinking will occur, and the deformation of the PET bottle 1 will be rather large.

Here, the distance between the upper side 57a and the lower side 58a of the quadrangle panel 55a is the axial length HPa of the upper quadrangle panel, and the distance between the upper side 57b and the lower side 58b of the quadrangle panel 55b is the lower quadrangle panel. Is defined as the axial length HPb of. The ratio of the axial length HPa of the upper quadrangular panel and the axial length HPb of the lower quadrangular panel to the total height H1 of the PET bottle 1 from the bottom wall 42 to the mouth 10 of the bottom 40 is 0. It is preferably .06 or more and 0.35 or less.

The axial length HPa of the upper quadrangular panel and the axial length HPb of the lower quadrangular panel may be the same. However, one side, for example, the axial length HPb of the lower quadrangular panel is made as large as possible, and the axial length HPa of the upper quadrangular panel is made as small as possible. It is preferable that the strength of the PET bottle 1 can be maintained while increasing the amount of change absorbed. Here, the axial length HPb of the lower quadrangular panel is as large as possible while the lower quadrangular panel 55b has strength in a configuration without the upper quadrangular panel 55a. The guideline is the length that most absorbs the change in internal pressure. On the other hand, the axial length HPa of the upper quadrangular panel is defined as being as small as possible so that the upper quadrangular panel 55a at least absorbs a change in internal pressure.

The PET bottle 1 may be configured such that the axial length HPb of the lower quadrangular panel is smaller than the axial length HPa of the upper quadrangular panel.

On the other hand, the distance between the ridges 59a and 59a of the quadrilateral panel 55a is defined as the circumferential width WPa of the upper quadrilateral panel, and the distance between the ridges 59b and 59b of the quadrilateral panel 55b is defined as the circumferential width WPb of the lower quadrilateral panel. To do. The ratio of the circumferential width WPa of the upper quadrangular panel and the circumferential width WPb of the lower quadrangular panel to the maximum body diameter D1 is preferably 0.2 or more and 0.8 or less.

Since the aspect ratios of the axial length HPa and HPb of the quadrangular panels 55a and 55b and the circumferential width WPa and WPb can be uniformly reduced, for example, a rectangle is closer to a square. It is preferable, and if it is a parallelogram, it is preferable that it is closer to a rhombus.

If the number of the quadrangular panel 55a constituting the upper pressure absorbing portion 53 and the quadrangular panel 55b forming the lower pressure absorbing portion 54 becomes too large, the areas of the individual quadrangular panels 55a and the quadrangular panel 55b become excessive. Becomes smaller. Then, the quadrangular panel 55a and the quadrangular panel 55b, which are too small, are less likely to be deformed inside and outside the PET bottle 1, so that it is difficult to absorb the change in the internal pressure of the PET bottle 1.

On the other hand, as the number of the quadrangular panels 55a and the quadrangular panels 55b is small, the axial load applied to each of the upper side 57a and the lower side 58a, and the upper side 57b and the lower side 58b becomes larger, and from one end to the other end of each side. The distance becomes longer. If the number of both the quadrangular panel 55a and the quadrangular panel 55b is too small, each side cannot sufficiently absorb the axial load of the PET bottle 1 and becomes a bending point, and the PET bottle 1 becomes a bending point. It becomes easy to buckle and deform.

The number of the quadrangular panel 55a constituting the upper pressure absorbing portion 53 and the quadrangular panel 55b constituting the lower pressure absorbing portion 54 is preferably 3 or more and 9 or less, respectively, 5 or more and 7 or less. It is more preferable that the number is odd, and the number is even more preferable. If the number of quadrangular panels 55a is an odd number, they do not face each other. Similarly, if the number of quadrangular panels 55b is an odd number, they do not face each other. The upper pressure absorbing portion 53 and the lower pressure absorbing portion 54 configured in this way can effectively disperse the load and increase the buckling strength and the side wall strength of each. The number of the quadrangular panels 55a and the number of the quadrangular panels 55b may be different, or may be the same from the viewpoint of balance.

The plurality of quadrangular panels 55a constituting the upper pressure absorbing portion 53 may have the same shape from the viewpoint of preventing the stress with respect to the load on the PET bottle 1 from concentrating on the specific portion of the upper pressure absorbing portion 53. preferable. This also applies to the lower pressure absorbing portion 54.

The cross-sectional shape of each of the quadrangular panel 55a and the quadrangular panel 55b in the horizontal direction may be a curved shape curved inward in the radial direction of the PET bottle 1, a straight line, or outward. It may be curved and curved. This is appropriately designed according to the intended use of the PET bottle 1.

For example, the quadrangular panel 55a and the quadrangular panel 55b curved inward quickly and surely deform inward when the internal pressure of the PET bottle 1 decreases, and absorb the change in internal pressure with high responsiveness, but the amount of deformation thereof. Is relatively small and limited. On the other hand, when the internal pressure of the PET bottle 1 increases, the responsiveness of absorbing the internal pressure change is slightly reduced, but the amount of deformation can be increased, and a larger internal pressure change can be absorbed. However, if the amount of deformation is too large, it may be inverted so as to be curved outward. If this inversion occurs only in a part of the quadrangular panel 55a and the quadrangular panel 55b, the appearance is deteriorated and the commercial value is lowered. The quadrangular panel 55a and the quadrangular panel 55b curved toward the outside act in the opposite manner as described above.

The upper cylindrical portion 60 has a cylindrical shape having the same upper and lower diameters. The upper cylindrical portion 60 is formed with a plurality of reinforcing grooves 61, 62, 63, and 64 which are recessed inward in the radial direction of the PET bottle 1 and extend in an annular shape in the circumferential direction. The reinforcing groove 61 is located above the upper cylindrical portion 60. The reinforcing groove 62 is located below the upper cylindrical portion 60. The reinforcing groove 63 and the reinforcing groove 64 are located between the reinforcing groove 61 and the reinforcing groove 62. The reinforcing grooves 61, 62, 63, and 64 all have a circular cross-sectional shape in the horizontal direction and a substantially arc-shaped vertical cross-sectional shape. Reinforcing grooves 61, 62, 63, and 64 can increase the side wall strength of the upper cylindrical portion 60. Then, by increasing the side wall strength of the upper cylindrical portion 60, the vendor suitability, which is a characteristic of whether or not the PET bottle 1 is normally discharged from the vending machine, and the ease of attaching the label to the upper cylindrical portion 60, The ease of holding the PET bottle 1 is improved.

The reinforcing grooves 61, 62, 63, and 64 all have a substantially arcuate cross-sectional shape in the vertical direction, so that even if the PET bottle 1 is hung in a state of being filled with high-temperature contents, the PET bottle 1 is hung in the axial direction. It is prevented from being deformed so as to stretch and shrink the body diameter.

As the depth of the reinforcing grooves 61, 62, 63, and 64 increases, the side wall strength increases, while the shapeability of the PET bottle 1 decreases. Therefore, it is preferable that the depth of the reinforcing grooves 61, 62, 63, and 64 is increased at the minimum necessary portion. Therefore, the reinforcing grooves 61, 62, 63, and 64 include those having large and small depths.

The reinforcing grooves 61 and 62 have a greater depth than the reinforcing grooves 63 and 64. The reinforcing groove 61 having a large depth and the reinforcing groove 62 increase the side wall strength in the vicinity of each groove. As a result, for example, the strength of the portion in contact with the extrusion plate of the vending machine is increased. Further, the effect extends not only in the vicinity of each groove but also in the region between the reinforcing groove 61 and the reinforcing groove 62. Therefore, the depths of the reinforcing grooves 63 and 64 between the reinforcing groove 61 and the reinforcing groove 62 are reduced, the distance between the reinforcing groove 63 and the reinforcing groove 64 is widened, and the reinforcing grooves 63 and 64 are widened. Even if the number of the above is reduced, the strength of the side wall of the upper cylindrical portion 60 is less likely to decrease. Further, since the unevenness of the reinforcing groove 63 and the reinforcing groove 64 is suppressed, for example, the appearance defect when the shrink label is attached is less likely to occur, and the manufacturing efficiency and the display effect (advertising effect) of the label are improved. Can be done.

If the depths of the reinforcing grooves 61, 62, 63, and 64 are too shallow, the side wall strength of the upper cylindrical portion 60 does not increase, and the upper cylindrical portion 60 is easily crushed, which makes the PET bottle 1 suitable for benders and easy to hold. Will decrease. On the other hand, if the depths of the reinforcing grooves 61, 62, 63, and 64 are too deep, the shapeability of the PET bottle 1 at the time of molding is lowered, and the reinforcing grooves 61, 62, 63, and 64 are used as base points. Buckling is likely to occur. The depth of the reinforcing grooves 61, 62, 63, 64 is preferably 0.03, preferably 0.005 or more and 0.07 or less, in relation to the maximum body diameter D1, which is the diameter of the upper cylindrical portion 60. Is more preferable.

If the widths of the reinforcing grooves 61, 62, 63, and 64 are too narrow, the shapeability of the PET bottle 1 at the time of molding tends to decrease. On the other hand, if the reinforcing grooves 61, 62, 63, and 64 are too wide, the shrink label attached to the upper cylindrical portion 60 is affected by the unevenness of the reinforcing grooves 61, 62, 63, and 64, resulting in poor appearance. It is easy to become a label, which in turn leads to a decrease in purchasing motivation. The widths of the reinforcing grooves 61, 62, 63, and 64 preferably have a ratio of the reinforcing grooves 61, 62, 63, 64 to the depth of 0.5 or more and 5.0 or less.

Here, a configuration in which four reinforcing grooves 61, 62, 63, and 64 are formed in the upper cylindrical portion 60 is exemplified. However, the number thereof is not particularly limited, and is appropriately designed depending on the vertical width of the upper cylindrical portion 60, the depth and width of the groove, and the like.

The lower cylindrical portion 70 has a cylindrical shape having the same upper and lower diameters. The lower cylindrical portion 70 is formed with a reinforcing groove 71 that is recessed inward in the radial direction of the PET bottle 1 and extends in an annular shape in the circumferential direction. The reinforcing groove 71 can increase the side wall strength of the lower cylindrical portion 70.

The reinforcing groove 71 may be configured in the same manner as the reinforcing groove 61 and the like described above. Further, here, a configuration in which one reinforcing groove 71 is formed in the lower cylindrical portion 70 is exemplified. However, the number thereof is not particularly limited, and is appropriately designed depending on the vertical width of the lower cylindrical portion 70, the depth and width of the reinforcing groove 71, and the like.

The lowermost region of the body portion 30 and the lower cylindrical portion 70 is the heel portion 72. When the PET bottle 1 is blow-molded from its prototype preform (preform), the heel portion 72 is thin because the distance from the bottom of the preform is long and the draw ratio is increased accordingly. It is a place that tends to turn into white and sometimes whiten.

It is preferable that both the upper connecting portion 80 and the lower connecting portion 85 are circumferential grooves that are recessed inward in the radial direction of the PET bottle 1 and extend in an annular shape in the circumferential direction. By forming the upper connecting portion 80 and the lower connecting portion 85 as a circumferential groove, the strength of the side wall in the vicinity of each connecting portion can be increased. The upper connecting portion 80 and the lower connecting portion 85 have a circular cross-sectional shape in the horizontal direction and a substantially U-shape having a flat bottom surface in the vertical cross-sectional shape. The upper connecting portion 80 and the lower connecting portion 85 may have a substantially arcuate cross-sectional shape in the vertical direction so that the PET bottle 1 extends in the axial direction even if the PET bottle 1 is hung with the high temperature contents filled. It is prevented from being deformed into.

If the depth of both the upper connecting portion 80 and the lower connecting portion 85 is too shallow, the side wall strength cannot be increased and the bender suitability is lowered. On the other hand, if the depth of both the upper connecting portion 80 and the lower connecting portion 85 is too deep, the shapeability of the PET bottle 1 at the time of molding is lowered. The depths of the upper connecting portion 80 and the lower connecting portion 85 are preferably 0.005 or more and 0.07 or less, and more preferably 0.03, respectively, with respect to the minimum body diameter D2.

If the width of the upper connecting portion 80 and the lower connecting portion 85 is too wide, the side wall strength cannot be increased and the bender suitability is lowered. On the other hand, if the widths of the upper connecting portion 80 and the lower connecting portion 85 are too narrow, the shapeability of the PET bottle 1 at the time of molding is lowered. The widths of the upper connecting portion 80 and the lower connecting portion 85 are preferably 0.5 or more and 5.0 or less in proportion to the depth of the upper connecting portion 80 and the lower connecting portion 85, respectively.

FIG. 4 is a bottom view of the PET bottle 1. The bottom portion 40 is connected to the lower side of the lower cylindrical portion 70 of the body portion 30. The bottom portion 40 has a corner portion 41, a bottom wall 42, a dome 43, and a rib 44. The corner portion 41 is curved toward the lower side in the axial direction of the PET bottle 1 and the outer side in the radial direction. The substantially flat plate annular bottom wall 42 extends in the direction perpendicular to the body portion 30 and serves as a ground plane for the PET bottle 1. The dome 43 projects from the bottom wall 42 toward the inside (upper side) of the PET bottle 1 on the inner circumference of the bottom wall 42, and has a function of improving the strength of the bottom portion 40. The dome 43 is provided with a plurality of ribs 44 having a function of reinforcing the dome 43 radially in a bottom view.

The bottom portion 40 is not limited to the example shown in FIG. 4, and may be configured so as not to be easily deformed downward even when positive pressure is applied in a state where it is easily deformed by heat. As a result, it is possible to prevent the full filling capacity of the PET bottle 1 from increasing and the change in the internal pressure from becoming larger. The dome 43 is designed to be maintained at least above the ground plane of the PET bottle 1 even if it is deformed by heat. As a result, the bottom portion 40 is prevented from protruding outward (lower side) from the bottom wall 42, and the PET bottle 1 can be prevented from rattling or tipping over.

As described above, the PET bottle 1 according to the present embodiment has a mouth portion 10, a shoulder portion 20, a body portion 30, and a bottom portion 40, and the body portion 30 has a partially narrowed body diameter. The constricted portion 50 has a constricted portion 50, and the constricted portion 50 is composed of an annular peripheral groove 51 and square panels 55a and 55b connected in the circumferential direction on both sides in the axial direction with reference to the peripheral groove 51, respectively, and PET. It has a pressure absorbing portion 52 that deforms inside and outside the PET bottle 1 in response to a change in the internal pressure of the bottle 1. In the PET bottle 1 according to the present embodiment, even if the weight is reduced, the PET bottle 1 sufficiently withstands the load from the axial direction and the waist circumference direction, absorbs the change in the internal pressure, and has a dent in the shoulder portion 20 and the body portion 30. Deformation such as flatness and kinking is sufficiently suppressed. Therefore, according to the present embodiment, a PET bottle that has both light weight and high strength against an external force and absorbs both positive pressure and negative pressure inside to suppress deformation even under harsh conditions. 1 can be provided.

Next, the configuration of the plastic bottle according to the modified example will be described in detail. FIG. 5 is a front view showing the PET bottle 2 according to the modified example, and FIG. 6 is a side view of the PET bottle 2 according to the modified example. The PET bottle 2 is different from the PET bottle 1 except that the ridges 59a and 59b of the quadrangular panels 55a and 55b parallel to each other in the axial direction with respect to the peripheral groove 51 are arranged alternately in the circumferential direction. It has the same configuration and effect.

The PET bottle 2 has an annular peripheral groove 51 and pressure absorbing portions 52A on both sides in the axial direction with reference to the peripheral groove 51 in the constricted portion 50. The pressure absorbing portion 52A has an upper pressure absorbing portion 53A on the upper side in the axial direction and a lower pressure absorbing portion 54 on the lower side in the axial direction with reference to the peripheral groove 51. Similar to the upper pressure absorbing portion 53, the upper pressure absorbing portion 53A is formed in a tubular shape by connecting a plurality of flat plate-shaped quadrangular panels 55a in the circumferential direction. However, the ridge line 59a and the ridge line 59b are not arranged like a continuous line, and the lower end of the ridge line 59a and the upper end of the ridge line 59b are located at different positions in the circumferential direction. Since the lower end of the ridge line 59a and the upper end of the ridge line 59b are located at different positions in the circumferential direction, the locations where the ridge line 59b is connected in the axial direction are doubled, the side wall strength is increased, and the quadrangular panel 55a is deformed. , The deformation of the quadrangular panel 55b can be made less likely to affect each other.

The upper pressure absorbing portion 53A illustrated in FIGS. 5 and 6 is configured in a state of being rotated by 36 ° in the circumferential direction from the upper pressure absorbing portion 53 with respect to the lower pressure absorbing portion 54. As described above, it is more preferable that the lower end of the ridge line 59a is arranged between the ridge lines 59b and 59b adjacent to each other in the circumferential direction. By arranging the ridge lines 59a and the ridge lines 59b alternately in the circumferential direction in this way, the stress generated in the peripheral groove 51 can be dispersed in a well-balanced manner on both sides in the axial direction, and the internal pressure changes more severely. Deformation such as kinking of the PET bottle 1 due to the above can be suppressed. Further, the PET bottle 2 having a high design property can be provided by the configuration in which the ridge lines 59a and the ridge lines 59b are arranged alternately in the circumferential direction.

The PET bottle 1 and the PET bottle 2 (hereinafter, the description is appropriately omitted because they are the same as the PET bottle 1) according to the present embodiment are not limited by the size, and can be applied to various sizes. .. For example, the volume of the PET bottle 1 may be 100 ml or more and 2000 ml or less. The total height H1 of the PET bottle 1 may be 100 mm or more and 300 mm or less, and the maximum body diameter D1 of the body portion 30 may be 30 mm or more and 80 mm or less. Further, the PET bottle 1 according to the present embodiment can be suitably used for a lightweight bottle. The mass of the PET bottle 1 is, for example, 20 g or more and less than 40 g for 1000 ml, and 15 g or more and less than 25 g for 500 ml.

Examples of the material of the plastic bottle for which PET bottle 1 is exemplified include polyolefins such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-vinyl alcohol copolymer, and plants. Various plastics that can be blow-molded, such as polylactic acid, can be used. However, it is preferable that the plastic bottle is mainly composed of polyester such as polyethylene naphthalate, particularly polyethylene terephthalate. In addition, various additives such as a colorant, an ultraviolet absorber, a mold release agent, a lubricant, a nucleating agent, an antioxidant, and an antistatic agent are blended in the above-mentioned resin as long as the quality of the molded product is not impaired. be able to.

As the ethylene terephthalate-based thermoplastic resin constituting the PET bottle 1, the ethylene terephthalate unit occupies most of the ester repeating portion, generally 70 mol% or more, and the glass transition point (Tg) is 50 ° C. or higher and 90 ° C. or higher. It is preferable that the melting point (Tm) is in the range of 200 ° C. or higher and 275 ° C. or lower. As an ethylene terephthalate-based thermoplastic polyester, polyethylene terephthalate is particularly excellent in terms of pressure resistance, etc., but in addition to the ethylene terephthalate unit, it is composed of dibasic acids such as isophthalic acid and naphthalenedicarboxylic acid, and diols such as propylene glycol. Copolymerized polyesters containing a small amount of ester units can also be used.

Polyethylene terephthalate has the highest production volume among thermoplastic synthetic resins. The polyethylene terephthalate resin has various properties such as excellent heat resistance, cold resistance, chemical resistance, and abrasion resistance. Furthermore, polyethylene terephthalate resin has a lower proportion of petroleum in its raw material than other plastics, and can be recycled. As described above, according to the structure containing polyethylene terephthalate as a main component, a material having a large amount of production can be used, and various excellent properties thereof can be utilized.

Polyethylene terephthalate is obtained by condensation polymerization of ethylene glycol (ethane-1,2-diol) and purified terephthalic acid. It is preferable that at least one of a germanium compound, a titanium compound, and an aluminum compound is used as the polymerization catalyst of polyethylene terephthalate. By using these catalysts, it is possible to form a container having higher transparency and excellent heat resistance than the antimony compound is used.

A plastic bottle can be produced by blow molding a preform obtained by injection molding the above-mentioned material. However, the PET bottle 1 as an example of the plastic bottle according to the present embodiment can cope with a harsh situation. Therefore, the PET bottle 1 according to the present embodiment is used for a hot pack implant, which is a manufacturing method in which all the steps such as molding the PET bottle 1 from the preform and filling the PET bottle 1 with a high-temperature beverage are performed by an in-line method. It can also be applied.

Next, the filling material manufacturing apparatus according to the present embodiment in which such a hot pack implant is embodied will be described in detail. FIG. 7 is a schematic view schematically showing the manufacturing apparatus 100 of the filler 8 according to the present embodiment. The manufacturing apparatus 100 for the filler 8 according to the present embodiment includes a heating unit that heats the body of the preform 5, a molding unit that blow-molds the PET bottle 1 from the preform 5 using a mold, and a PET bottle 1. A filling part filled with a high-temperature liquid, a mounting part for mounting the cap 7 on the mouth 10 of the PET bottle 1, a tipping sterilization part for overturning the mouth 10 and the cap 7 of the PET bottle 1, and a PET bottle. A cooling unit for cooling 1 is provided. In the manufacturing apparatus 100 of the filler 8 according to the present embodiment, an apparatus for molding the PET bottle 1 from the preform 5 which is a preformed article, an apparatus for filling the PET bottle 1 with a high-temperature liquid, and the like are all in-line methods. It is characterized by being composed of.

The in-line method here may be a synchro method in which the molding portion and the filling portion are connected, or a separate method in which the molding portion and the filling portion are separated from each other and the PET bottle 1 is air-conveyed. Further, the injection molding apparatus for forming the preform 5 may be included in the various apparatus configured by the in-line method in the filler 8 manufacturing apparatus 100 according to the present embodiment.

The bottle molding machine 110 includes a heating device 111 as a heating section and a biaxial stretching blow molding device 112 as a molding section. When the preform 5 is formed into a bottle shape, the preform 5 is first heated.

FIG. 8 is a cross-sectional view showing an example of the heating device 111 of the preform 5. Note that FIG. 8 shows a cross section in the direction perpendicular to the transport direction of the preform 5.

The heating device 111 includes a transfer device 113 and a heater 114. The transport device 113 is configured to transport the preform 5 while rotating it around the axis of the preform 5 in order to uniformly heat the body portion 15 of the preform 5 in the circumferential direction. The heater 114 is composed of a plurality of, for example, halogen lamps, and is configured to heat the body 15 of the preform 5 to a temperature suitable for blow molding, for example, 115 ° C. or higher and 135 ° C. or lower. Further, the heating device 111 is for preventing the heat from the heater 114 from being released to the outside of the heating device 111 and the reflector 115 for reflecting the heat from the heater 114 to the body portion 15 of the preform 5. A shielding member 116 or the like may be provided. In the heating device 111 of FIG. 8, the preform 5 is conveyed and heated with the mouth portion 10 facing downward.

FIG. 9 is a cross-sectional view schematically showing the preform 5 and the PET bottle 1 after blow molding. The biaxial stretching blow molding device 112 includes a mold 117, a stretching rod 118, an air supply device (not shown), and a control device for controlling these. Although FIG. 9 illustrates the biaxial stretch blow molding apparatus 112 of the downward blow molding method, an upward blow molding method in which the material is not easily affected by gravity may be used.

The mold 117 has a shape corresponding to the PET bottle 1 to be formed, and for example, a body mold 117a corresponding to the body 30 and being divided in half, and a bottom mold 117b corresponding to the bottom 40. Has. The surface temperature of the body mold 117a is controlled to be controlled to, for example, 80 ° C. or higher and 125 ° C. or lower, preferably 90 ° C. or higher and 120 ° C. or lower, more preferably 90 ° C. or higher and 115 ° C. or lower. On the other hand, the temperature of the surface of the bottom mold 117b is controlled to be 5 ° C. or higher and 30 ° C. or lower. The temperature of the surface of the body mold 117a exceeds the glass transition point (Tg) of polyethylene terephthalate.

By setting the surface temperature of the mold 117 to 120 ° C. or lower, the material of the mold 117 is, for example, a hardened and tempered stainless steel having a large weight and a heavy workload for handling, or a steel material for a mold. Aluminum can be used instead. By using aluminum, the mold 117 can be easily processed, the degree of freedom in design is increased, and the manufacturing cost can be suppressed. Further, since the weight of the mold 117 is reduced, the mold replacement work becomes easy.

It is preferable that the body die 117a has a rough surface portion 117R in which at least a part of the surface, more specifically, a portion in contact with the heel portion 72 of the PET bottle 1 is roughened (roughened). The method for forming the rough surface portion 117R is not particularly limited, and may be a physical treatment method such as sandblasting or polishing treatment, or a chemical treatment method such as etching. The heel portion 72 is a portion that is generally difficult to mold. This is particularly remarkable at the heating temperature of the preform 5 set in the manufacturing apparatus 100 of the filler 8 according to the present embodiment and the temperature of the surface of the body mold 117a. However, by providing the rough surface portion 117R at the portion in contact with the heel portion 72, the mold release is improved, local excessive shrinkage is prevented, and as a result, the shapeability of the PET bottle 1 is improved. ..

It is preferable that a concave receiving portion 117c is formed in the center of the bottom mold 117b. The receiving portion 117c is configured so that the tip of the drawing rod 118 can be inserted into the receiving portion 117c. The receiving portion 117c has a function of preventing the bottom portion 18 from being eccentric in the radial direction when the preform 5 is stretched by the stretching rod 118.

The extension rod 118 is configured so that the inside of the mold 117 can be expanded and contracted. Then, the extension rod 118 is configured to extend the body portion 15 of the preform 5 having the mouth portion 10 attached to the mold 117 in the vertical (axial) direction. The air supply device is configured to blow out air P whose pressure and temperature are regulated. The air P may be supplied to the inside of the preform 5 attached to the mold 117, may be blown out from the extension rod 118, or may be blown out from a member different from the extension rod 118. The air P is configured to extend the body portion 15 of the preform 5 in the lateral (diameter) direction. The air P blown out from the stretching rod 118 lowers the surface temperature of the body portion 15 to quench it, and improves heat resistance.

As shown in FIG. 7, the hot filling machine 120 has a filler 121 as a filling portion and a capper 122 as a mounting portion. The filler 121 is such that the contents of the hot liquid that has been sterilized by heating, for example, the beverage 6 is injected into the PET bottle 1 as it is at a high temperature, for example, 71 ° C. or higher and 95 ° C. or lower, more preferably 81 ° C. or higher and 90 ° C. or lower. It is configured. The capper 122 as a mounting portion is configured to mount the cap 7 on the mouth portion 10 of the PET bottle 1 filled with the beverage 6. The PET bottle 1 is sealed by the attached cap 7 to form the filler 8.

The overturn sterilizer 130 as an overturn sterilizer tilts the filler 8 at a predetermined time, for example, 30 seconds 90 degrees or more, and heats the high-temperature beverage 6 to heat the inside of the filler 8, especially the mouth of the PET bottle 1. It is configured to sterilize the portion 10 and the cap 7. The sterilization time is appropriately designed according to the type of the beverage 6 and the temperature.

The pastorizer 140 as a cooling unit has, for example, four constant temperature baths for storing water having a plurality of temperatures as a heat exchange liquid, and a spout such as a nozzle. In the pastryzer 140, high temperature water such as 65 ° C. is sprayed to heat and sterilize the filler 8 from the outside, and then the temperature of the water to be sprayed is gradually lowered. Water is sprayed to cool the filler 8 (PET bottle 1). Cooling by the pastorizer 140 has an effect of preventing a change in the flavor of the beverage 6 filled in the filler 8. The temperature of the liquid contained in the first tank of the pastryzer 140 is preferably 65 ° C. or lower. By quenching the filler 8 at 65 ° C. or lower, damage to the body 30 of the PET bottle 1 due to heat can be reduced.

The manufacturing device 100 of the filler 8 has a labeler, a caser 150, a printing device, an inspection device, and the like as a subsequent stage of these devices. The labeler attaches a label to the filler 8 (PET bottle 1). The caser packs the filler 8 into a cardboard box in a predetermined number, for example, every 24 pieces. The filler 8 according to the present embodiment is manufactured by using the devices and the like described above.

Next, the method for producing the filler 8 according to the present embodiment will be described in detail. FIG. 10 is a flow chart showing an outline of the manufacturing process of the filler 8 according to the present embodiment. In the present embodiment, at least, a step of heating the body 15 of the preform 5, a step of blow molding the PET bottle 1 from the preform 5 using the mold 117, and filling the PET bottle 1 with the high-temperature beverage 6 It includes a step of attaching the cap 7 to the mouth 10 of the PET bottle 1, a step of overturning and sterilizing the mouth 10 and the cap 7 of the PET bottle 1, and a step of cooling the PET bottle 1. The present embodiment is characterized in that all the steps such as molding the PET bottle 1 from the preform 5 and filling the PET bottle 1 with the high-temperature beverage 6 are performed by an in-line method. In the following, each step will be described in more detail.

First, the preform 5 is supplied to the bottle molding machine 110 (step S1). In the method for producing the filler 8 according to the present embodiment, the preform 5 in which the mouth portion 10 is in a non-crystalline state is used. However, the side of the opening end of the mouth portion 10 may be heat-treated at, for example, about 160 ° C. to 180 ° C. to partially crystallize. The supplied preform 5 is delivered after being aligned.

As described above, even if the injection molding apparatus, the compression molding apparatus, the compression injection molding apparatus, etc. for forming the preform 5 are configured in the in-line method in the manufacturing apparatus 100 of the filler 8 according to the present embodiment. good. Then, in this case, the preform 5 supplied to the bottle molding machine 110 is formed by the injection molding apparatus in an in-line manner. Then, the preform 5 is supplied to the bottle molding machine 110 by a cold parison method, a hot parison method, and an in-line method.

Next, the preform 5 is heated (step S2). The body 15 of the preform 5 conveyed to the heating device 111 of the bottle molding machine 110 is heated by a plurality of heaters 114 to, for example, a temperature of 115 ° C. or higher and 135 ° C. or lower.

When the temperature of the preform 5 to be heated is less than 115 ° C., the heat resistance is insufficient, and the PET bottle 1 formed after that cannot cope with hot filling for filling the high temperature contents. It transforms into a distorted shape. On the other hand, when the temperature of the preform 5 to be heated exceeds 135 ° C., the preform 5 before bottle molding becomes too crystallized and blow molding cannot be performed. In that respect, if the temperature of the preform 5 to be heated is 135 ° C. or lower, crystallization proceeds to some extent, but blow molding is possible.

Next, blow molding of the PET bottle 1 is performed by stretching the preform 5 (step S3). The heated preform 5 is mounted on the mold 117 of the biaxial stretching blow molding apparatus 112. In the method for producing the filler 8 according to the present embodiment, the surface temperature of the body mold 117a is 80 ° C. or higher and 125 ° C. or lower, preferably 90 ° C. or higher and 120 ° C. or lower, more preferably 90 ° C. or higher and 115 ° C. or lower. It is said that. By setting the temperature within this range, the outer surface of the PET bottle 1, particularly the body portion 30, is crystallized, and the PET bottle 1 has a heat-resistant structure. Therefore, in a later step, a PET bottle 1 that can be filled with the high-temperature beverage 6 can be produced. When the surface temperature of the body mold 117a is less than 80 ° C., the heat resistance becomes low, while when the surface temperature of the body mold 117a exceeds 125 ° C., the PET bottle 1 is used as the body mold 117a. The initial contraction when it comes into contact with the mold becomes large, and deformation, that is, sink marks are likely to occur.

Here, in the present embodiment, the effect is realized when both the temperature of the preform 5 to be heated and the temperature of the surface of the body mold 117a exceed a certain level. The temperature of the body portion 15 of the preform 5 is more preferably higher than the temperature of the surface of the body mold 117a. When the temperature of the body portion 15 is higher than the temperature of the surface of the body mold 117a, the above-mentioned initial shrinkage is less likely to occur.

First, the body portion 15 of the preform 5 mounted on the mold 117 is stretched in the vertical direction by the stretching rod 118. The lower the temperature of the preform 5 when it is stretched, the more likely it is that the bottom 18 is eccentric. If it is eccentrically stretched, it tends to be deformed in the deviated direction, which is not preferable. However, the preform 5 may be eccentrically stretched even if the temperature is set high by guiding the tip of the stretching rod 118 to the center by the receiving portion 117c provided in the center of the bottom mold 117b. Be prevented.

At this time, the longitudinal stretching ratio from the preform 5 to the PET bottle 1 is preferably 1.8 or more and 4.0 or less. Here, the longitudinal stretching ratio is the ratio (H4 / H3) of the height H4 (see FIG. 9) of the body 30 of the PET bottle 1 to the height H3 (see FIG. 9) of the body 15 of the preform 5. is there. The molecules of the preform 5 having an amorphous structure, which is an aggregate of the amorphous portion and the crystalline portion, undergo orientation crystallization by stretching, and as a result, the strength, rigidity, and heat resistance of the PET bottle 1 are increased. Therefore, in a later step, a PET bottle 1 that can be filled with the high-temperature beverage 6 can be produced. When the longitudinal stretching ratio is less than 1.8, the orientation of the molecules of the preform 5 does not increase, while when the longitudinal stretching ratio exceeds 4.0, it becomes difficult to mold the PET bottle 1.

Further, the pressure- and temperature-controlled air P is blown out from the air supply device and supplied to the inside of the preform 5. First, the body portion 15 of the preform 5 is stretched laterally to the extent that it does not hit the body mold 117a by the low-pressure air P1 of, for example, 5 bar or more and 16 bar or less supplied together with the stretching of the preform 5 in the vertical direction. (Pre-blow). After that, the body portion 15 of the preform 5 is stretched laterally by high-pressure air P2 having a size of 20 bar or more and 38 bar or less in about 0.5 to 1.5 seconds until it hits the body mold 117a.

At this time, the lateral stretching ratio from the preform 5 to the PET bottle 1 is preferably 1.8 or more and 3.0 or less. Here, the lateral stretching ratio refers to the outer diameter (maximum body diameter D1) of the body 30 of the PET bottle 1 with respect to the outer diameter D3 (see FIG. 9) of the body 15 of the preform 5 (see FIGS. 1 and 9). ) Is the ratio (D1 / D3). The molecules of the preform 5 are similarly oriented and crystallized by stretching in the lateral direction, and as a result, the strength, rigidity, and heat resistance of the PET bottle 1 are increased. Therefore, in a later step, a PET bottle 1 that can be filled with the high-temperature beverage 6 can be produced. When the transverse stretching ratio is less than 1.8, the orientation of the molecules of the preform 5 does not increase, while when the transverse stretching ratio exceeds 3.0, the PET bottle 1 becomes difficult to mold.

In addition, in order to prevent the body 30 of the PET bottle 1 from being crystallized too much and becoming difficult to stretch, it is predetermined from the time when the preform 5 is attached to the mold 117 until it is stretched into the shape of the PET bottle 1. It is controlled to fit in time.

In the method for producing the filler 8 according to the present embodiment, cooling air may be further blown onto the PET bottle 1 in the blow molding step (step S4). FIG. 11 is a schematic view showing an example of blowing the cooling air C1 onto the PET bottle 1.

The PET bottle 1 formed by biaxial stretching blow molding sticks to the mold 117 of the biaxial stretching blow molding apparatus 112. Then, the stretching rod 118 is arranged inside the mold 117 and the PET bottle 1. The extension rod 118 is provided with a cooling air blowing portion 119. The cooling air blowing unit 119 communicates with the air supply device, and is configured to blow out the high-pressure cooling air C1 whose pressure and temperature are controlled. By providing the cooling air blowing portion 119, it is possible to improve the deformation due to the initial shrinkage when the PET bottle 1 comes into contact with the body mold 117a. The pressure of the cooling air C1 may be the same as that of the high pressure air P2, and the blowing time of the cooling air C1 may be about 1/20 to 1/3 of that of the high pressure air P2. More specifically, the blowing time of the cooling air C1 is either 0.05 seconds to 0.6 seconds and 1% to 90%, more preferably 5% to 30% of the time of the high pressure air P2. Is preferable.

Vents are formed in the extension rod 118 in the radial (lateral) direction, and the cooling air C1 is blown in a direction substantially perpendicular to the inner surface of the body 30 of the PET bottle 1. The body 30 of the PET bottle 1 begins to shrink as soon as it touches the body mold 117a. When the cooling air C1 is blown there, the body portion 30 is pressed in the direction of the body mold 117a to suppress its deformation and impart heat resistance to the body portion 30. Therefore, the body 30 of the PET bottle 1 that has been blow-molded and is in a high temperature state is further promoted to crystallize by being blown with the cooling air C1. The temperature of the cooling air C1 is preferably 1 ° C. or higher and 30 ° C. or lower. When the temperature of the cooling air C1 is less than 1 ° C., a temperature distribution is generated in the body portion 30 and strain is likely to occur. On the other hand, when the temperature of the cooling air C1 exceeds 30 ° C., the body portion 30 Is less likely to be cooled and its heat resistance is reduced.

Alternatively, the high-pressure air P2 blown out from the extension rod 118 may be gradually switched to the cooling air C1. This method also promotes crystallization of the body 30 of the PET bottle 1. It is preferable that the ratio of the cooling air C1 is gradually increased from the end stage of the step of blowing the high pressure air P2 in the blow molding, for example, from 1% to 90%, more preferably 5% to 30%. If the time is too short, the effect of this method is less likely to appear, and if the time is too long, the crystallization of the body portion 30 is less likely to be promoted.

It is preferable to blow the cooling air C1 also on the outer surface side of the body 30 of the PET bottle 1. By doing so, crystallization is also promoted on the outer surface side of the body 30 of the PET bottle 1. The cooling air C1 may be sprayed on the outer surface of the body portion 30 after the mold 117 is opened, or the spraying may be continued until the next step is started.

By blowing the cooling air C1 onto the body 30 of the PET bottle 1 in this way, it is possible to impart heat resistance to the body 30 while effectively suppressing the shrinkage of the body 30, and further, the body 30 can be provided with heat resistance. The surface temperature of the PET bottle 1 can be rapidly lowered to shorten the speed required for producing the PET bottle 1. Further, when the cooling air C1 is sprayed on the body 30 of the PET bottle 1, the shrinkage of the body 30 can be effectively suppressed, so that the temperature of the surface of the body mold 117a is set to, for example, 125 ° C. Can be set higher. Therefore, by blowing the cooling air C1, crystallization can be further promoted, and a PET bottle 1 having heat resistance at a higher temperature can be produced.

Here, in the polyethylene terephthalate as the main raw material constituting the PET bottle 1, a crystalline region portion (crystal portion) in which the molecular chain is crystallized and an amorphous region portion (amorphous portion) in which the molecular chain is not crystallized are mixed. .. Polyethylene terephthalate has a molecular chain when it is heat-treated at a glass transition temperature of about 70 ° C. or higher in which the amorphous portion has fluidity and a melting point of about 260 ° C. or lower in which the crystalline portion also flows, particularly about 140 ° C. to 160 ° C. Has the property of increasing the proportion of crystalline parts due to the orientation of. Such a crystalline portion with respect to the sum of the crystalline portion and the amorphous portion is referred to as crystallinity. The higher the crystallinity, the stronger the intermolecular force, so that the heat resistance is improved.

Since the crystalline portion has a higher density than the amorphous portion, the higher the crystallinity, the higher the density. That is, polyethylene terephthalate has a property that the higher the density, the higher the heat resistance. Furthermore, since scattering occurs at these boundaries due to the difference in refractive index between the amorphous part and the crystalline part, light is more likely to be scattered as the number of crystal parts increases, and haze (of the transmitted light in the visible light region). (Percentage of scattered light) becomes high. That is, polyethylene terephthalate has a property that the higher the haze, the higher the heat resistance.

The crystallinity of the body 30 of the PET bottle 1 is preferably 25% or more and 45% or less, and more preferably 25% or more and 39% or less. If the crystallinity is within this range, the heat-resistant PET bottle 1 can be molded from the preform 5 with good shapeability. The crystallinity of the body 30 of the PET bottle 1 can be derived from the density. In addition, the crystallinity of the body 30 of the PET bottle 1 can also be evaluated by Raman spectroscopic analysis.

The density of the body 30 of the PET bottle 1 produced by the method for producing the filler 8 according to the present embodiment is 1.637 g / cm ³ or more and 1.387 g / cm ³ or less. The density of the body 30 of the PET bottle 1 can be measured by a specific gravity method, for example, a density gradient tube method, using a cut piece obtained by cutting a part of the body 30 into, for example, 1 cm square as a sample. By measuring the density of the body 30 of the PET bottle 1 in the packing material 8 manufactured by the manufacturing apparatus 100 configured by the in-line method, it can be determined whether or not the manufacturing method of the filling material 8 according to the present embodiment has been used. Can be determined.

Further, the tensile fracture strain of the body 30 of the PET bottle 1 produced by the method for producing the filler 8 according to the present embodiment is 40% or more and 68% or less.

As a method for measuring the tensile fracture strain of the body 30 of the PET bottle 1, a cut piece cut out from a part of the body 30 into, for example, a short side of 10 mm × a long side of 50 mm is used as a sample, and the sample is taken in the long side direction. One of the extending samples is fixed and then pulled in the long side direction at 85 ° C. and 300 mm / min. Then, the tensile fracture strain of the body 30 of the PET bottle 1 can be examined by measuring by what percentage the pulling force causes the bottle to break. Whether or not the method for manufacturing the filler 8 according to the present embodiment was used by measuring the tensile fracture strain of the body 30 of the PET bottle 1 in the filler 8 manufactured by the manufacturing apparatus 100 configured by the in-line method. Can be determined. Here, the maximum load shown when the sample is cut is the tensile strength, and the value divided by the cross-sectional area is the tensile stress.

The blow-molded PET bottle 1 separates from the mold 117. In the method for producing the filler 8 according to the present embodiment, since the in-line method is used, the blow molding time is shortened as much as possible, and the PET bottle 1 is liable to shrink. However, since the rough surface portion 117R of the body mold 117a is squeezed, the rough surface portion 117R and the heel portion 72 are in contact with each other at points rather than at a solid surface, and the heel portion 72 contracts inward. There is no waviness or waviness, and sink marks are unlikely to occur. Therefore, the shapeability of the PET bottle 1 can be improved. Further, in the method for producing the filler 8 according to the present embodiment, the production time can be shortened as compared with the heat-resistant bottle, the production efficiency can be increased, and the production cost can be reduced.

The surface roughness (Ra) of the heel portion 72 of the PET bottle 1 produced by the method for producing the filler 8 according to the present embodiment is 0.3 μm or more and 3 μm or less. With a surface roughness of this degree, it is possible to maintain the characteristic of being transparent while having heat resistance. As an index of the surface roughness of the heel portion 72, for example, the arithmetic mean roughness Ra can be used. As a method for measuring the arithmetic mean roughness Ra, it can be examined by image analysis of three-dimensional data obtained by a laser microscope. The method for manufacturing the filler 8 according to the present embodiment by measuring the surface roughness of the body portion 30, particularly the heel portion 72 of the PET bottle 1 in the filler 8 manufactured by the manufacturing apparatus 100 configured by the in-line method. Can be determined whether or not was used.

Next, as shown in FIG. 10, the PET bottle 1 is supplied to the hot filling machine 120 (step S5). Since the manufacturing apparatus 100 of the filler 8 according to the present embodiment is configured by the in-line method, the molded PET bottle 1 is promptly supplied to the hot filling machine 120. The supplied PET bottle 1 is sequentially delivered by, for example, grippers attached to the outer peripheral portions of each of a plurality of rotating disc-shaped transfer wheels, and is carried to the filler 121. It is preferable that the time from molding the PET bottle 1 to supplying it to the hot filling machine 120 is within 10 seconds. As described above, since the method for producing the filler 8 according to the present embodiment is an in-line method, the PET bottle 1 is used for filling the beverage 6 with little decrease in heat resistance due to humidification.

On the other hand, in the hot filling machine 120, the beverage 6 filled in the PET bottle 1 is sterilized by heating (step S6). The heating sterilization is performed by appropriately setting a predetermined temperature and holding time such as 120 ° C. for 4 minutes, 85 ° C. for 30 minutes, etc., depending on the characteristics of the beverage 6, for example, acidity and water activity. ..

Then, the PET bottle 1 is filled with the beverage 6 in the filler 121 of the hot filling machine 120 (step S7). Fila 121 injects the contents of a hot liquid that has been sterilized by heating, for example, a beverage 6 into a PET bottle 1 as it is at a high temperature, for example, 71 ° C. or higher and 95 ° C. or lower, more preferably 81 ° C. or higher and 90 ° C. or lower. Similarly, the PET bottle 1 filled with the beverage 6 is sequentially delivered by the gripper and carried to the capper 122.

The PET bottle 1 produced by the method according to the present embodiment does not have as much heat resistance as that formed by molding the body mold 117a widely used for hot filling at a temperature of 160 ° C. or higher. .. However, the PET bottle 1 has sufficient heat resistance to be filled with the above-mentioned temperature range, for example, a high temperature beverage 6 having a temperature of 71 ° C. or higher and 95 ° C. or lower, more preferably 81 ° C. or higher and 90 ° C. or lower. Made in. Then, in the method for producing the filler 8 according to the present embodiment, a method is used in which the beverage 6 is filled at the time when the heat resistance is most maintained immediately after the PET bottle 1 is molded. Therefore, according to the method for producing the filler 8 according to the present embodiment, the PET bottle 1 can be filled with the high-temperature beverage 6 without any problem.

In this way, the PET bottle 1 can be filled with the hot beverage 6. Therefore, for example, the inner surface of the PET bottle 1 can be sufficiently sterilized with a high-temperature beverage 6 having a temperature of 71 ° C. or higher and 95 ° C. or lower, more preferably 81 ° C. or higher and 90 ° C. or lower. Then, when sufficient sterilization is performed, even if oxygen is sealed together with the beverage 6 in the filler 8, the risk of aerobic germs growing is extremely low, so that the PET bottle 1 is not necessarily fully filled with the beverage 6. It doesn't have to be. Therefore, according to the method according to the present embodiment, it is possible to effectively prevent the growth of bacteria on the outer surface of the PET bottle 1, which is more likely to occur as the filling is full.

As described above, in the method for producing the filler 8 according to the present embodiment, the PET bottle 1 is blow-molded and the PET bottle 1 is filled with the beverage 6 in an in-line manner. Therefore, the PET bottle is used. The heat resistance of 1 is maintained in a high state. However, from the viewpoint of further maintaining the heat resistance of the PET bottle 1, at least the PET bottle 1 is blow-molded in the manufacturing apparatus 100 of the filler 8, and then the PET bottle 1 is filled with the beverage 6. It is even more preferable that the PET bottle 1 is held in an environment of a predetermined humidity or less, preferably 40% or less in the region until the drink is made.

Next, the cap 7 is supplied to the capper 122 of the hot filling machine 120 (step S8). Although the cap 7 may be sterilized by, for example, ultraviolet irradiation, in the method for producing the filler 8 according to the present embodiment, the cap 7 is not sterilized before the beverage 6 is filled. There may be. By sterilizing the cap 7, the filling temperature of the beverage 6 and the temperature of the pastorizer 140 can be lowered, and the heat resistance of the PET bottle 1 required for manufacturing the filler 8 can be lowered. it can.

Then, in the capper 122, the cap 7 is attached to the PET bottle 1 (step S9). As a result, the filler 8 according to the present embodiment is formed. The steps up to this point are preferably performed in a space where cleanliness, environmental conditions such as temperature and humidity are controlled, such as a sterile area. The formed filler 8 is carried to the overturn sterilizer 130 by a transport band such as a conveyor.

Next, the overturning sterilizer 130 performs overturning sterilization of the filler 8 (step S10). The tipping sterilizer 130 conveys the filler 8 while lying down, for example. When the filler 8 is overturned, the cap 7 and the inner surface of the PET bottle 1 in particular near the mouth 10 are sterilized by coming into contact with the hot beverage 6.

Subsequently, the pastorizer 140 cools the filler 8 (step S11). As described above, the temperature of the liquid contained in the first tank of the pastryzer 140 is preferably 65 ° C. or lower. By quenching the filler 8 at 65 ° C. or lower, damage to the mouth 10 of the PET bottle 1 due to heat can be reduced. After that, the liquid temperature of the beverage 6 inside the filler 8 is gradually lowered by the second and subsequent tanks of the pastorizer 140, and finally cooled to room temperature.

After that, the filler 8 is labeled with a labeler and a caser 150, and then boxed in a cardboard box. The filler 8 according to the present embodiment is manufactured by the above method.

The amount of reduced pressure of the filler 8 produced by the method for producing the filler 8 according to the present embodiment is 1 kPa or more and 20 kPa or less. The amount of decompression of the filler 8 can be measured by a pressure gauge, for example, a diaphragm type pressure gauge. The amount of decompression is measured by inserting a perforation needle that communicates with a detector included in the pressure gauge into the head space of the filler 8. By measuring the amount of reduced pressure of the filler 8 produced by the manufacturing apparatus 100 configured by the in-line method, it can be determined whether or not the method for producing the filler 8 according to the present embodiment has been used. At this time, a value corresponding to the contents is appropriately set for the depressurized amount of the filler 8.

Production of a PET bottle 1 having heat resistance applicable to hot filling and a filler 8 in which a filler 8 hot-filled with a beverage 6 is produced in-line by providing each of the steps described above. A method can be provided. The PET bottle 1 according to the present embodiment can also be applied to a manufacturing method that is not in-line.

According to the method for producing the filler 8 according to the present embodiment, unlike the method in which the preformed plastic bottle is supplied to the filling device for the contents, the temperature is high within a short time after the PET bottle 1 is molded. You can proceed to the step of filling the beverage 6. Therefore, filling is started before the crystallinity of the body 30 of the PET bottle 1 is lowered, and the high-temperature beverage 6 can be filled without lowering the heat resistance thereof. It should be noted that these machines are combined as one device rather than simply connecting the transport path of the PET bottle 1 between the bottle molding machine 110 (biaxial stretching blow molding device 112) and the hot filling machine 120 (filler 121). By doing so, the effect is further enhanced.

When the widely used heat-resistant bottle is molded, the temperature of the body mold 117a is set high, for example, 150 ° C. or higher and 165 ° C. or lower. When the temperature of the body mold 117a rises, the initial shrinkage becomes large and deformation occurs, the material of the mold 117 is limited and the cost increases, and the temperature difference from the external environment, especially the air temperature, becomes large and heat resistance There is a large variation in quality such as heat resistance and shape of the bottle. Further, when the temperature of the body mold 117a rises, it is necessary to increase the time for which the high-pressure air P2 is blown, and the manufacturing capacity drops. On the other hand, according to the method for producing the filler 8 according to the present embodiment, it is possible to fill the high-temperature beverage 6 even if the heat resistance of the PET bottle 1 is lower than that of the widely used heat-resistant bottle. The temperature of the body mold 117a can be lowered. Therefore, according to the method for producing the filler 8 according to the present embodiment, it is possible to prevent the above-mentioned problems from occurring.

Further, according to the method for manufacturing the filler 8 according to the present embodiment, an in-line method capable of molding the PET bottle 1 at a higher speed than the method in which the preformed plastic bottle is supplied to the filling device for the contents is used. Therefore, the cost of manufacturing the filler 8 can be reduced.

Further, according to the method for producing the filler 8 according to the present embodiment, since the method in which the preform 5 is supplied instead of the PET bottle 1, the cost of transporting the material can be reduced. That is, when the PET bottle 1 is molded in-line, the form of the container supplied to the manufacturing apparatus 100 of the filler 8 can be changed to the preform 5 having a smaller volume than the PET bottle 1, and the container can be changed. It is possible to significantly increase the number of shipments from the manufacturer, for example, 6 times or more. Therefore, the manufacturing apparatus 100 and the manufacturing method of the filler 8 according to the present embodiment in which the bottle molding machine 110 of the PET bottle 1 is in-lined contributes to the reduction of the transportation cost of the container and the reduction of the environmental load. Become.

Next, a method for producing the filler 8 according to another embodiment will be described in detail. FIG. 12 is a flow chart showing an outline of the manufacturing process of the filler 8 according to another embodiment. The method for producing the filler 8 according to another embodiment is characterized in that the step (step S4) of blowing the cooling air C1 onto the PET bottle 1 is omitted from the production method shown in FIG. Here, in the manufacturing method according to another embodiment, the description of the same part as the manufacturing method shown in FIG. 10 will be omitted as appropriate.

In the manufacturing method according to another embodiment, the PET bottle 1 is blow-molded by stretching the preform 5 in the same manner as the manufacturing method shown in FIG. 10 (step S3). However, in the method for producing the filler 8 according to another embodiment, the temperature of the surface of the body mold 117a is 80 ° C. or higher and 115 ° C. or lower.

Again, the temperature of the body 15 of the preform 5 heated in step S2 is preferably higher than the temperature of the surface of the body mold 117a. If the temperature of the body portion 15 is higher than the temperature of the surface of the body mold 117a, initial shrinkage is less likely to occur.

Then, similarly to the manufacturing method shown in FIG. 10, the body portion 15 of the preform 5 mounted on the mold 117 is stretched in the vertical direction by the stretching rod 118. Further, the body portion 15 of the preform 5 stretched in the vertical direction is stretched laterally by the high-pressure air P2 until it hits the body mold 117a.

In the method for producing the filler 8 according to another embodiment, the blowing of the cooling air C1 (step S4) to the PET bottle 1 is omitted in the blow molding step. However, in the method for producing the filler 8 according to another embodiment, the temperature of the surface of the body mold 117a is set to 80 ° C. or higher and 115 ° C. or lower, and the temperature of the body portion 15 of the preform 5 to be heated is set to 80 ° C. or higher and 115 ° C. or lower. , The temperature is raised above the surface temperature of the body mold 117a. As a result, the initial shrinkage when the body portion 15 of the preform 5 is stretched and hits the body mold 117a is effectively suppressed. Therefore, in the method for producing the filler 8 according to another embodiment, even if the step of blowing the cooling air C1 onto the PET bottle 1 (step S4) is omitted, the PET bottle 1 has heat resistance applicable to hot filling. And the filling body 8 in which the beverage 6 is hot-filled can be produced.

The blow-molded PET bottle 1 is supplied to the hot filling machine 120 (step S5), and thereafter, the filling body 8 is manufactured through the same steps as the manufacturing method shown in FIG. ..

The method for producing the filler 8 according to another embodiment has the same effect as the production method shown in FIG.

In addition to this, in the method for manufacturing the filler 8 according to another embodiment, the temperature of the surface of the body mold 117a can be set lower. Therefore, as the material of the mold 117, for example, stainless hardened tempered steel or Aluminum can be used instead of mold steel. By using aluminum, the mold 117 can be easily processed, the degree of freedom in design is increased, and the manufacturing cost can be suppressed. Further, in the method for manufacturing the filler 8 according to another embodiment, it is possible to eliminate the need for an apparatus for blowing the cooling air C1. Therefore, it is possible to use the biaxial stretch blow molding apparatus 112 that does not have the cooling air blowing portion 119, and the versatility can be enhanced. Further, in the method for producing the filler 8 according to another embodiment, since the step of blowing the cooling air C1 (step S4) is unnecessary, the PET bottle 1 and the beverage 6 are hot-filled to prepare the filler 8. The speed can be improved.

As described above, the method for manufacturing the filler 8 according to the present embodiment includes a step of heating the body 15 of the preform 5 and blowing the PET bottle 1 from the preform 5 using the mold 117. The step of molding, the step of filling the PET bottle 1 with the high-temperature beverage 6, the step of attaching the cap 7 to the mouth 10 of the PET bottle 1, and the step of overturning and sterilizing the mouth 10 and the cap 7 of the PET bottle 1. It is characterized in that it includes a step and a step of cooling the PET bottle 1, and all the steps are performed by an in-line method.

According to the present embodiment, the PET bottle 1 has both light weight and high strength against external force, and absorbs both positive pressure and negative pressure inside, so that deformation can be suppressed even under harsh conditions. , And a method for producing the filler 8.

Hereinafter, the present disclosure will be described in more detail and concretely with reference to Examples. However, the present disclosure is not limited to the following examples.

<Material and manufacturing method>
[Example 1]
A 22 g preform 5 made of polyethylene terephthalate and having a transparent mouth 10 was used. Then, a filler 8 composed of a PET bottle 1 having a full filling capacity of 520 ml according to the present embodiment shown in FIG. 1 and the like and 500 ml of water filled at 85 ° C. is filled as shown in FIG. It was made in-line from preform 5 by the method of making body 8. At that time, the body portion 15 of the preform 5 was heated to 118 ° C., and the surface temperature of the body mold 117a was set to 115 ° C. The blow molding step (step S3) included a step of blowing cooling air C1 onto the PET bottle 1 (step S4).

In the filler 8 according to the first embodiment, the body portion 30 has a constricted portion 50 having a narrowed body diameter, and the constricted portion 50 is based on an annular peripheral groove 51 and a peripheral groove 51. A book in which quadrangular panels 55a and 55b are connected in the circumferential direction on both sides in the axial direction, and have a pressure absorbing portion 52 that deforms inside and outside the PET bottle 1 in response to a change in the internal pressure of the PET bottle 1. It had the characteristics according to the embodiment.

[Example 2]
In Example 2, it was the same as in Example 1 except that the PET bottle 2 shown in FIG. 5 and the like was used. Therefore, the filler 8 according to the second embodiment also has the characteristics according to the present embodiment like the filler 8 according to the first embodiment.

[Comparative Example 1]
Comparative Example 1 was the same as that of Example 1 except that the PET bottle 200 shown in FIG. 13 was used. The PET bottle 200 does not have a constricted portion, has an elliptical pressure absorbing panel 201 whose long side extends in the axial direction, and a pillar 202 extending in the axial direction between adjacent pressure absorbing panels 201 and 201. have. Therefore, the filler according to Comparative Example 1 did not have the characteristics according to the present embodiment.

[Comparative Example 2]
Comparative Example 2 was similar to Example 1 except that 25 g of preform was used and the PET bottle 300 shown in FIG. 14 was used. Although the PET bottle 300 has a constricted portion 301, it has a pressure absorbing portion 303 only on one (lower) side in the axial direction with reference to the peripheral groove 302. Therefore, the filler according to Comparative Example 2 did not have the characteristics according to the present embodiment.

[Comparative Example 3]
Comparative Example 3 was the same as Comparative Example 2 except that 22 g of Preform 5 was used. Therefore, the filler according to Comparative Example 3 did not have the characteristics according to the present embodiment.

<Evaluation method>
(Lightweight)
Each PET bottle of Example 1 and Example 2, and Comparative Example 1, Comparative Example 2, and Comparative Example 3 was withdrawn at the forming stage, and it was determined by the weight of the PET bottles whether or not weight reduction could be achieved. In determining the weight reduction, a threshold value of 25 g or more or less than 25 g was set. Table 1 shows the results of the evaluation of the lightness of each PET bottle, and is indicated by ◯: with lightness and ×: without lightness.

(Buckling strength test)
The buckling strength of each PET bottle in an upright state was measured for each of the fillers of Example 1, Example 2, and Comparative Example 1, Comparative Example 2, and Comparative Example 3. A tester manufactured by AGR, TOP LOAD, was used for measuring the buckling strength. A load is applied from above each mouth at a constant speed, and the maximum load in a so-called yield state is defined as the buckling strength. For the determination of buckling strength, 250 N or more or less than 250 N was set as a threshold value. Table 1 shows the results of evaluation of the buckling strength of each filler, and is indicated by: ◯: with buckling strength and ×: insufficient buckling strength.

(Wall side strength test)
For each of the fillers of Example 1, Example 2, and Comparative Example 1, Comparative Example 2, and Comparative Example 3, the side wall strength test of each body portion of each PET bottle in a horizontally placed state was performed. For the side wall strength test, TOP LOAD, a tester manufactured by AGR, was used. Each PET bottle was fixed so as not to roll, and a load was applied from the top of each body until it reached 60 N at a constant speed. In determining the side wall strength, a threshold value was set as to whether the maximum body diameter D1 when a load of 60 N was applied was 61 mm or more or less than 61 mm. Table 1 shows the results of evaluation of the side wall strength of each filler, and is indicated by ◯: side wall strength, and ×: side wall strength insufficient.

(Pressure resistance performance test)
The pressure resistance performance of each of the fillers of Example 1, Example 2, and Comparative Example 1, Comparative Example 2, and Comparative Example 3 was measured. The suction amount at the time when the contents were sucked out after the perforation needle was inserted into each mouth and the PET bottle was clearly deformed was used as an index of the pressure resistance performance. In determining the pressure resistance performance, a threshold value of 30 ml or more or less than 30 ml was set. Table 1 shows the results of evaluation of the pressure resistance performance of each filler, and is indicated by ◯: with pressure resistance performance and ×: insufficient pressure resistance performance.

(Comprehensive evaluation)
Based on the above-mentioned lightness, buckling strength test, side wall strength test, and pressure resistance performance test, each PET bottle of Example 1 and Example 2, and Comparative Example 1, Comparative Example 2, and Comparative Example 3 ( Comprehensive evaluation of each filler) was made. Table 1 shows the results of the comprehensive evaluation. The overall evaluation is indicated by ○: good, ×: no aptitude.

The following points were derived from the above-mentioned examples. As shown in Table 1, in Examples 1 and 2, while being lightweight, they had sufficient buckling strength and side wall strength, and were also excellent in pressure resistance performance. On the other hand, in Comparative Example 1, although the weight was reduced, the buckling strength and the side wall strength were insufficient. Comparing the results of Comparative Example 2 and Comparative Example 3, when the weight reduction is slightly insufficient as in Comparative Example 2, the buckling strength and the side wall strength are sufficient, and the pressure resistance performance is also excellent. On the other hand, when the weight was reduced as shown in Comparative Example 3, the withstand voltage performance was insufficient.

From the results of the above examples, the PET bottle 1 and the filler 8 according to the present embodiment can sufficiently withstand the load from the vertical direction and the waist circumference direction and absorb the change in the internal pressure even if the weight is reduced. It was shown that deformation such as dents, flatness, and kinks of the shoulder portion 20 and the body portion 30 can be sufficiently suppressed. Moreover, according to the method for producing the filler 8 according to the present embodiment, it was shown that the PET bottle 1 and the filler 8 having such characteristics can be produced without any problem. Therefore, in the present embodiment, the PET bottle 1, which has both light weight and high strength against external force, absorbs both positive pressure and negative pressure inside, and suppresses deformation even under harsh conditions, is filled. It has been shown that a method for producing the body 8 and the filler 8 can be provided.

The present disclosure can be suitably used for producing various fillers 8 to be filled with a liquid as a content. However, the present disclosure is not limited to the embodiments and examples described above. The filler 8 of the present disclosure contains, for example, various non-carbonated beverages such as water, green tea, oolong tea, black tea, coffee, fruit juice, soft drinks, and carbonated beverages, or seasonings such as soy sauce, sauce, and mirin. It is useful for all fillers 8 containing edible oils, foods containing alcoholic beverages, detergents, shampoos, cosmetics, pharmaceuticals, etc. In particular, since the deformation of the container is suppressed even under severe changes in internal pressure, it is possible to maintain a high commercial value even if the contents have no expiration date, no expiration date, or extremely long contents. Since the container of the filler 8 of the present disclosure has heat resistance, it is suitable for heated sales at stores and the like, and since the container has sufficient side wall strength, it can be used in vending machines. Is also suitable.

1, 2 PET bottles (plastic bottles)
5 Preform 6 Beverage (liquid)
7 Cap 8 Filler 10 Mouth 15 Preform 5 Body 20 Shoulder 22 Rib 30 PET Bottle 1 Body 40 Bottom 50 Constriction 51 Circumferential Groove 52, 52A Pressure Absorber 53, 53A Upper Pressure Absorber 54 Bottom Lateral pressure absorbers 55a, 55b Square panel (panel)
56a, 56b Chamfering part 59a, 59b Ridge line 60 Upper cylindrical part 61, 62, 63, 64, 71 Reinforcing groove 70 Lower cylindrical part 100 Manufacturing equipment for filler 8 110 Bottle molding machine 111 Heating equipment (heating part)
112 Biaxial stretch blow molding equipment (molding part)
117 Mold 120 Hot filling machine 121 Filler (filling part)
122 Capper (mounting part)
130 Fall sterilizer (Tumble sterilizer)
140 Pastorizer (cooling part)
D1 Maximum body diameter D2 Minimum body diameter H1 Overall height of PET bottle 1 H2 Axial length of constriction 50 HPa Axial length of upper quadrangle panel HPb Axial length of lower quadrangle panel WPa Upper quadrangle panel Circumferential width WPb Circumferential width of lower quadrilateral panel θa Angle of ridge line 59a to vertical line θb Angle of ridge line 59b to vertical line

Claims (24)

In a plastic bottle having a mouth, shoulders, body, and bottom
The body is
Partly has a constricted part with a narrowed body diameter,
The constricted part is
An annular peripheral groove and
Approximately quadrangular panels are connected in the circumferential direction on both sides in the axial direction with reference to the peripheral groove, and have pressure absorbing portions that deform inside and outside the plastic bottle in response to a change in the internal pressure of the plastic bottle. And
The pressure absorbing part is
A chamfered portion is further provided between the panels adjacent to each other in the circumferential direction.
The distance between the left and right ridges of the chamfered portion above the peripheral groove widens upward.
Distance between the ridges of the right and left of the chamfered portion below the said circumferential groove, Ri spread downward,
The upper the panel of a horizontally than the peripheral groove, the panel below the said circumferential groove is a plastic bottle, wherein an elongated der Rukoto. The plastic bottle according to claim 1, wherein the peripheral groove is formed at a position where the body diameter is the minimum. The body is
Cylindrical portions having the largest body diameter are provided on both sides of the constricted portion in the axial direction.
The cylindrical part is
Has an annular reinforcing groove,
The plastic bottle according to any one of claims 1 to 2, wherein the reinforcing groove has an arcuate cross section. The plastic bottle according to claim 3, wherein the reinforcing groove includes one having a large and small depth. Any of claims 1 to 4, wherein the ratio of the axial length of the constricted portion to the total height of the plastic bottle from the bottom portion to the mouth portion is 0.2 or more and 0.6 or less. Or the plastic bottle described in item 1. Any of claims 1 to 5, wherein the ratio of the axial length of the panel to the total height of the plastic bottle from the bottom to the mouth is 0.06 or more and 0.35 or less. The plastic bottle according to item 1. The plastic bottle according to any one of claims 1 to 6, wherein the ratio of the width of the panel in the circumferential direction to the maximum body diameter is 0.2 or more and 0.8 or less. The plastic bottle according to any one of claims 1 to 7, wherein the plurality of panels connected in the circumferential direction are composed of an odd number of panels. The plastic bottle according to any one of claims 1 to 8, wherein the inclination of the ridge line that separates the adjacent panels in the circumferential direction with respect to the axial direction is 0 ° or more and 60 ° or less. The plastic bottle according to claim 9, wherein the inclination differs between the ridgeline of the panel on one side in the axial direction and the ridgeline of the panel on the other side. The plastic bottle according to any one of claims 9 to 10, wherein the ridgelines of the panel parallel to both sides in the axial direction with respect to the circumferential groove are arranged alternately in the circumferential direction. The shoulder
It has iris diaphragm-shaped ribs and
The plastic bottle according to any one of claims 1 to 11, wherein the direction of inclination of the rib is the same as the direction of inclination of the ridgeline. The plastic bottle according to any one of claims 1 to 12, wherein the plastic bottle has heat resistance to a high-temperature liquid to be filled, and the mouth portion is transparent. The plastic bottle according to claim 13, wherein the temperature of the high-temperature liquid is 71 ° C. or higher and 95 ° C. or lower. The plastic bottle according to claim 13, wherein the temperature of the high-temperature liquid is 81 ° C. or higher and 90 ° C. or lower. The plastic bottle according to any one of claims 1 to 15, wherein the crystallinity of the body portion is 25% or more and 45% or less. The plastic bottle according to any one of claims 1 to 16, wherein the material constituting the plastic bottle is polyethylene terephthalate. The plastic bottle according to claim 17, wherein the density of the body portion is 1.567 g / cm ³ or more and 1.387 g / cm ^{3 or less.} Claims 1 to 1, wherein the body portion is cut into a 10 mm × 50 mm cut piece, and the tensile fracture strain at 300 mm / min at 85 ° C. of the cut piece is 40% or more and 68% or less. The plastic bottle according to any one of 18. The plastic bottle according to any one of claims 1 to 19.
A filler characterized by being composed of a hot liquid to be filled. The filler according to claim 20, wherein the reduced pressure amount of the filler is 1 kPa or more and 20 kPa or less. A method of manufacturing a plastic bottle molded from a preform having a transparent mouth.
The plastic bottle
It has a mouth, shoulders, body, and bottom,
The body is
In part, the constricted part with a narrowed body diameter,
It has a cylindrical portion having the largest body diameter and a cylindrical portion on both sides in the axial direction across the constricted portion.
The cylindrical portion has an annular reinforcing groove and has an annular reinforcing groove.
The reinforcing groove includes those having a large and small depths.
The constricted part is
An annular peripheral groove and
On both sides of the axial direction relative to the circumferential groove is constituted panel substantially rectangular is continuous in the circumferential direction, and a pressure absorbing portion in response to a change in internal pressure of the plastic bottle to deform out of the plastic bottle Have and
The pressure absorbing part is
A chamfered portion is further provided between the panels adjacent to each other in the circumferential direction.
The distance between the left and right ridges of the chamfered portion above the peripheral groove widens upward.
The distance between the left and right ridges of the chamfered portion below the peripheral groove widens downward.
The panel above the peripheral groove is horizontally long, and the panel below the peripheral groove is vertically long.
Heating the barrel of the preform,
A step of blow molding the plastic bottle from the preform using a mold is provided.
In the blow molding process, a step of blowing cooling air to the plastic bottle is further provided.
A method for producing a plastic bottle, which comprises heating the body of the preform to 115 ° C. or higher and 135 ° C. or lower, and setting the temperature of the body mold of the mold to 80 ° C. or higher and 125 ° C. or lower. The step of blowing cooling air onto the plastic bottle is omitted.
The method for manufacturing a plastic bottle according to claim 22, wherein the temperature of the body mold is 80 ° C. or higher and 115 ° C. or lower. The method for producing a plastic bottle according to any one of claims 22 to 23, wherein the temperature of the body portion of the preform is higher than the temperature of the body mold.

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